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Red Cabbage Indicator - Practicals Experiment

Indicators are chemical compounds that can be added to a solution to determine whether the solution is acidic, basic or neutral. A red cabbage pH indicator is a purple-coloured solution that is often found in homes and can be used to prepare a solution that is used to test whether substances are acid or base.

The cabbage contains a pigment molecule called flavin or anthocyanin which changes the colour depending on the acidity of the solution. Now let’s conduct a red cabbage indicator experiment to observe the results.

To determine the chemicals are acids or bases.

Acids are sour in taste, Eg: vinegar  ( Ethanoic acid ) and lemons ( Citric acid ).

Alkalis are substances chemicals that react with acids and neutralize them. Eg: Soap and washing powder are alkaline.

Acids and alkalis are found in a number of substances, Some are edible and can be found in foods. Some are very strong and can be harmful, such as the acid used in car batteries and the alkali used in oven cleaners.

Apparatus Required

Red cabbage leaves

Lemon juice

baking soda

Glass jars of the same size

Cut the cabbage leaves into small pieces, boil a cup of water separately.

Place the cabbage pieces in a bowl and pour the water into the bowl. Keep it for several minutes so that the cabbage pieces get soaked.

Take glass jars and place them apart. Pour every chemical (lemon juice, vinegar, detergent, and soda) in each jar.

Now to determine whether the substance is a base or an acid pour the cabbage juice indicator into each jar. If the mixture turns pink or red the chemical is an acid and if it turns blue or green the chemical is a base.

The Red Cabbage pH Scale

Different red cabbage ph levels and the colours obtained during the red cabbage juice indicator are given below:

(Image to be added soon)

Did You Know?

Apart from the solution, pH paper strips can also be made using red cabbage. We can use filter paper and dip it in the concentrated solution obtained from red cabbage. Soak it for some time and then take the paper to dry it. Once it is dried, cut the paper into small strips and they are ready to be used. Pour a drop of liquid on the test strip and check the colour obtained. The strip also turns red or green depending on whether it is acidic or basic.

FAQs on Red Cabbage Indicator

1. What is the pH of red cabbage juice?

The pH of red cabbage is around 7. It contains a chemical called anthocyanin which changes colour depending on the acidity of its environment.

2. Is red cabbage a natural indicator?

Red cabbage juice contains a natural pH indicator that changes colours depending on the acidity of the solution. The pigment in red cabbage that causes the red colour change is called flavin.

3. How long can we keep the red cabbage indicator?

Unused red cabbage indicator solution can be stored in a stoppered flask and refrigerated for one week.

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Chem lab 2 - LAB REPORT

Organic chemistry i (chem 3323), texas a&m university-kingsville.

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Red cabbage ph indicator, october, 2019, peter isibor k, in this experiment a ph indicator using the anthocyanidin compounds in red cabbage will be, made. a colorimetric ph indicator is a chemical compound added in small amounts to a, solution, so the ph of the solution can be determined visually. these indicators are frequently, employed in titrations in analytical chemistry and biology. anthocyanins can be employed as, colorimetric compounds because they change color at different ph values. the anthocyanidin, motif exhibits subtle structural changes dependent on fluctuation in ph. in an acidic, environment with a ph less than 7 the compound takes on the form. while in a neutral, environment with a ph equal to 7 it is purple. because of these color changes at different ph, values, it is possible to determine the ph of a solution based on the color that this indicator, turns. ph indicators such as anthocyanidin are added to solutions in minute quantities because, it exhibits strong chromophores to begin with. this quality along with the ability to achieve, structural change at different ph values establishes them as superior colorimetric ph indicators., in plants, anthocyanins are found in many flowers and fruits of plants and may serve a, protective role against extreme temperatures. the absorbance pattern responsible for the red, color of anthocyanins may be complementary to that of green chlorophyll in, photosynthetically-active plant tissues..

deionized water wasn’t used. In this case, attempt the procedure again more diligently. After extracting the anthocyanidins into the water, remove the solid cabbage pieces via vacuum filtration using either a Buchner or Fritted Funnel vacuum filtration. Make sure to use a course frit for the fritted funnel if employing this method of filtration. For this experiment we are interested in keeping the liquid and discarding the solid remains into the trash. Label seven test tubes with the following information and place them in a test tube rack. Be sure to add the specific amount described to each test tube and place them in a test tube rack, using a 10 ml graduated cylinder for precision being sure to read to the bottom of the meniscus. Employ an analytical balance for weighing the solids. To each test tube ad 3 ml of the red cabbage extract. Make sure to stir each solution with a glass rod to ensure complete dissolution and consistency with color throughout the test tube. The acid-base reaction between the chemical compounds and the anthocyanidins in the cabbage juice occurs very rapidly. Describe detailed observations of color changes in the lab notebook. Using rubber stoppers, thoroughly mix the 5 ml of 1. M acetic acid with the 0 grams of sodium acetate. Add 3 ml of the red cabbage extract to test tubes 8 and 9. Be sure to swirl the test tubes to mix thoroughly and record the observations. Next add 3 drops of 12 M Hydrochloric acid to both test tubes. Test tube 8 should have changed color within the addition of a few drops of the HCl. Test tube 9 should require more HCl before a color change is noted. Continue to add the 12 M hydrochloric acid 3 drops at a time to test tube 9 until a distinct color change is seen. Record observations. Do not add more than 30 drops

Test Tube No. and Substance Amount Color 1 M Hydrochloric acid 1 ml Pinkish red 1 M Acetic Acid 1 ml Pink Ascorbic acid (Vitamin C) .111 g Hot Pink Nothing (non buffer) N/A Purple Sodium Bicarbonate ( Anhydrate, Carbonate)

.108 g Olive Green

1 M Ammonia 1 ml Green Control # 4 + Di H2O 5 ml Lavender 1 M Acetic Acid + Sodium Acetate

5 ml + 0 g Light Pink; 8 drops

Calculations

None for this lab

Once 10-15 grams of red cabbage was obtained and washed, the red cabbage was torn into small pieces and placed into a large beaker with 150 ml of deionized water. The large beaker is then put onto a hot plate and the solution is then brought to a boil. The solution is boiling until the water is a dark purple color. Once the dark purple color is reached the beaker is carefully removed from the hot plate and allowed to cool. Then 8 test tubes are labeled, and the specific amount of each compound/chemical is put into its designated test tube. In test tube one, 1 ml of 1 M Hydrochloric acid mixed with the red

cabbage juice turned a pinkish red. In test tube two, 1 ml of 1 M Acetic Acid mixed with the red cabbage juice turned Pink. In test tube three, 0 g of Ascorbic acid mixed with the red cabbage juice turned Hot Pink. In test tube four, the red cabbage juice was put in the test tube because it was the non- buffer and since it was only the red cabbage juice in the test tube it was Purple. In test tube five, 0 g of Sodium Bicarbonate (Anhydrate) mixed with red cabbage juice turned an olive-green color. In test tube six, 1 ml of 1 M Ammonia plus the red cabbage juice turned green. In test tube seven, the control (test tube 4) plus 5 ml of distilled water turned lavender. In test eight, 5 ml of 1 M Acetic Acid and 0. g of sodium Acetate was mixed with 3 ml of the red cabbage extract it turned a light pink with 8 drops of HCl. Observations were recorded.

Organic Chemistry I Chem 3123 laboratory Manual Jason Abrams

Pre-Lab Questions

• Coumarin Isocoumarin Chromone
• The components in the solution
• Phenol Red, Cresol Red, m-Nitropheno, Thymol blue

by Unknown Author is licensed under

• Multiple Choice

Course : Organic Chemistry I (CHEM 3323)

University : texas a&m university-kingsville.

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• Acids, Bases and Salts
• Red Cabbage Indicator

Red cabbage Indicator

Red cabbage indicator is a purple-coloured solution that is used to test whether substances are acid or base . Red cabbage that is often found in homes can be used to prepare a solution that acts as a pH indicator. The cabbage basically contains a pigment molecule called flavin or anthocyanin that changes colour depending on the acidity of the solution.

Normally, the purple solution turns red in colour when it combines with something acidic and it turns bluishg-green in colour when it combines with a base. If the substance does not cause the colour to change then it is mostly neutral.

Red Cabbage Indicator pH Colours

Below are the different pH levels and the colours that are obtained during the red cabbage indicator test.

Let us conduct an experiment and observe the results.

To determine which chemicals are bases and which are acids.

Apparatus Required

• Red cabbage leaves
• Lemon juice
• Soda(baking soda)
• Glass jars of a similar size
• Cut the cabbage leaves into small pieces.
• Boil separate cups of water as they will be required to submerge your pieces later on.
• Place the cabbage pieces into a bowl and pour the water in the bowl. Keep it for several minutes so that the cabbage pieces get soaked. You can also use a mixer to grind the leaves and obtain a solution.
• If you are not using the mixture then separate the juice from the leaves.
• Take glass jars and place them about two inches apart. Pour every chemical (lemon juice, vinegar, detergent and soda) into each jar.
• Now to determine whether the substance is a base or an acid pour the cabbage juice into each jar. Here, if the mixture turns pink or red the chemical is an acid and if it turns bluish-green the chemical is usually a base.

This experiment can easily be conducted even in the house and can be used to test different substances which are easily available.

Safety Tips

•  Since the chemical indicator is used to test acids and bases it is always advised to use safety goggles and gloves especially while dealing with strong or concentrated chemicals.
• Chemicals can be washed down the drain safely with water.
• A neutralisation experiment can also be done along with the test.

Making pH Paper

In addition to the solution, pH paper strips can also be created using red cabbage using the steps given below: 1. Firstly, use a filter paper (or coffee filter) and dip it in the concentrated solution obtained from red cabbage.

2. Soak it for some time and later take the paper and dry it.

3. Once it is dried, cut the paper into small strips and they are ready to be used for testing the pH of different solutions.

4. Pour a drop of liquid on the test strip and see what colour is obtained. The strip also turns either red or green depending on whether it is acidic or basic.

Put your understanding of this concept to test by answering a few MCQs. Click ‘Start Quiz’ to begin!

Select the correct answer and click on the “Finish” button Check your score and answers at the end of the quiz

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Red Cabbage Science Experiment

I’m not a big fan of cabbage except for when it’s used for science! Food science is super cool and is awesome for kids. This isn’t the sweetest-smelling science experiment we have done, but once you get past the smell this cabbage science experiment is fascinating chemistry . Find out how to test pH with red cabbage!

Red Cabbage Experiment

Let’s make an indicator and test it out on common household solutions!

Watch the video:

Grab a head or two of red cabbage and let’s get started! Even if your kids swear they hate cabbage, they will be loving it (at least for science sake) after this awesome cabbage chemistry experiment.

• Red cabbage
• Several jars or small containers
• Lemons (grab a few for a couple of extra science activities you will find below)
• Baking soda
• Other acids and bases to test (see more items to test below)
• pH test strips (optional but older kids will enjoy the added activity)

Instructions:

STEP 1. S tart by cutting the red cabbage roughly into small pieces.

The cabbage indicator can be prepped ahead of time but I love when you can involve kids in the whole process!

STEP 3. Place your cut up cabbage in a medium saucepan and boil for 5 minutes.

STEP 3. After the 5 minutes, cover and let it rest for 30 minutes.

STEP 4. Go ahead and carefully pour the liquid into the jars. This is your acid-base indicator! ( You can dilute the cabbage juice and it will still work )

Testing Solutions With Red Cabbage Indicator

Now it’s time to test the pH of different items. We have a few common acids and bases for you to start with. This experiment is set up so that you add some of the acid or base to the jar of red cabbage juice, and observe the color change.

Please take care when mixing different items into your cabbage pH indicator. Adult supervision is recommended at all times. This NOT an edible science experiment!

You can find even more solutions to test out! Depending on your kid’s interest levels and needs, you could turn this into a huge science experiment. This red cabbage experiment also makes a terrific science fair project !

Before your kids start testing each one, have them make predictions about what color change they will see. Remember, red color is acidic and green color is basic.

Here are a few acids and bases to test…

1. LEMON JUICE

Squeeze lemon juice into one of the jars. What color did it change to?

What else can you do with lemons? We have a couple of fun ideas for exploring fun chemistry with this fruit!

• Erupting Lemon Volcano
• Make Fizzing Lemonade

2. BAKING SODA

Put a teaspoon of baking soda into a cabbage juice jar. Notice what happens! What color did the indicator change to?

If you have ever experimented with baking soda and vinegar, your kids may already know that baking soda is a base and vinegar is an acid. Vinegar is also a great liquid to use to test with your red cabbage indicator!

EXPERIMENT WITH: Baking Soda and Vinegar Science

4. BLACK COFFEE

Coffee is a common drink for many people. But is it an acid or a base?

DIY: Make your own pH strips by soaking coffee filters in the cabbage juice and hang to dry, cut in strips!

What Is An Indicator In Chemistry?

pH stands for power of hydrogen . The pH scale is a way to measure the strength of an acid or base solution, and is numbered from 0 to 14.

Distilled water has a pH of 7, and is considered a neutral solution. Acids have a pH lower than 7 and bases have a higher pH higher than 7.

If you ask the kids about what types of things around the house are acidic, they might say vinegar or lemons. An acid is usually recognized as something with a sour or sharp taste.  Baking soda is an example of a base.

An indicator is one way to work out the pH of a solution. Good indicators give a visible sign, usually a color change, when they come into contact with acids or bases. Like our red cabbage indicator below.

Why can red cabbage be used as an indicator to test pH?

Red cabbage contains  anthocyanin, which is a water-soluble pigment. This pigment changes color when mixed with an acid or a base. Redder when mixed with an acid and greener when mixed with a base.

TIP: Here’s a simple pH scale for kids with a little extra information. Plus it gives you a few more items to test once you have made your red cabbage pH indicator!

Click here to get your printable science experiment worksheets!

Applying The Scientific Method

This cabbage PH science experiment is a fantastic opportunity to use the scientific method and start a journal using the free mini pack above. You can read about incorporating the scientific method here , including more information on independent and dependent variables .

The first step in the scientific method is asking a question and developing a hypothesis. What do you think will happen if_______________? I think the_________ will___________if___________. This is the first step to diving deeper into science with kiddos and making connections!

You can also easily turn your cabbage science experiment into a fantastic presentation along with your hypothesis. Check out the resources below to get started.

• Easy Science Fair Projects
• Science Project Tips From A Teacher
• Science Fair Board Ideas

More Fun With Acids and Bases

Simple chemistry is cool! Check out more than 65 chemistry experiments for kids for more ideas!

Printable Science Projects For Kids

If you’re looking to grab all of our printable science projects in one convenient place plus exclusive worksheets and bonuses like a STEAM Project pack, our Science Project Pack is what you need! Over 300+ Pages!

• 90+ classic science activities  with journal pages, supply lists, set up and process, and science information.  NEW! Activity-specific observation pages!
• Best science practices posters  and our original science method process folders for extra alternatives!
• Be a Collector activities pack  introduces kids to the world of making collections through the eyes of a scientist. What will they collect first?
• Know the Words Science vocabulary pack  includes flashcards, crosswords, and word searches that illuminate keywords in the experiments!
• My science journal writing prompts  explore what it means to be a scientist!!
• Bonus STEAM Project Pack:  Art meets science with doable projects!
• Bonus Quick Grab Packs for Biology, Earth Science, Chemistry, and Physics

This is an awesome experiment to do, even for older kids! It shows them that chemistry is very much a part of our lives and are closer to us than we think! I’m sure kids would love it 🙂

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