btec applied science colorimetry assignment

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Applied science, titration and colorimetry, by isabella spence, introduction.

It took a lot of time and hard work, but I have finally managed to get a job at the prestigious company known as Chemcalequip a chemical plant, responsible for the production of testing and producing chemicals in the uk. Although I’m just a technical assistant I am very excited to show off my skills and knowledge during practical procedures. My main responsibility is to make and test standard solutions using titration and colorimetry procedures. Another Part of my role is to ensure equipment is calibrated and equipment and chemicals are safety checked. This is my report to show how I carried out my duties in the lab, it also shows cases my skills results and calculations alongside the evaluation of the whole process. During this experiment, I need to find the concentration of an unknow substance from substances known using an experiment called titration. The calibration of equipment is vital for this experiment, ensuring accurate results. A solution can be varied, but the simplest type of solution is one consisting of two substances:  Solute – a substance that is present in a smaller amount.  Solvent – a substance that is present in a larger amount and in which the solute is dissolved. The concentration of a solution is how much solute is dissolved per unit of solvent. High concentration means the amount of solute is high in the solution and low concentration means it is low. The amount of solvent is high in low concentration and low in high concentration of solute. The formular for concentration is: Amount of solvent/ Volume of solvent (C=n/v)

 Amount of solute is measures in moles (n is the number of moles/amounts of solution)  Concentration is measured in mol/dm3 (C= concentration)  Volume of the solvent is measured in dm

Indicators are substances which change color due to changes in ph. These are called acid-base indicators. They are usually weak acids or bases. Titration is a technique capable of determining the concentration of an unknown substance by using a standard solution, by making them react against one another and measuring the volume required to complete reaction. The number of moles in a standard solution is calculated using a balanced equation, the number of moles in the solution of unknown concertation can also be calculated, one the number of moles of the solution is known the concentration can easily be calculated. A standard solution is a solution of known concentration. Standard solutions are made by dissolving an accurate weight of mass of solvent in a known volume of solvent using a volumetric flask. The volumetric flask has a thin Rack which is marked with a line so it can be filled accurately to the correct capacity. Scandalization is the process of determine the exact concentration of a solution. The standard solution can then b e used to find the concentration of a second solution, with which it reacts. This is known as volumetric analysis or titration. The calibration of a solution is a process involving the use of thew instruments with values that are already known. It helps to maintain accuracy of the instruments and the results produced by this. Risk assessment Hazard Risk Controlled measure Sodium carbonate can be an irritant to the eyes and skin Wear goggles and uses gloves it is important to handle with care Sodium carbonate Getting on to our own clothes and causing damage Wear a lab coat to protect any personal clothes In case of emergencies In case something goes wrong we should be prepared for all types of emergencies. If the sodium carbonate does some in contact with the eyes it is important to flood you eyes with a gently running tap water for around ten minutes, and we should see a doctor if pain proceeds after this. If the substance is ingested(swallowed) we should do as much as wash out our mouths with water we should NOT make ourselves vomit, small sips of water may subside the irritation of the throat and jeep our airways open, after these actions have been undertaken its important to see a doctor even if our symptoms are no longer present, if it is spilt on clothing or even skin we should brush off the remaining solids and rinse the clothing or skin if necessary and finally if it spills on the floor bench chair etc. we should brush of the solids, trying to avid raising the dust then wipe with a damp cloth, wipe up solution spilt with a cloth and rinse it well.

First of all we weigh out 1 grams of sodium carbonate in a weighing boat making sure that our scales have been calibrated
Secondly, we transfer the sodium carbonate carefully into a large beaker accurately and precisely recording measurements to determine the exact mass transfer
Add 150cm3 of dissolve it in distilled water to the beaker stir with a glass rod and complete dissolving the sodium carbonate
Carefully and accurately transfer all off the solution to a 250cm3 volumetric flask, and make up the solution to 250cm3 with more distilled water Preparing a standard solution of NaCO 3 Aim: the aim is to prepare a standard solution if Na 2 CO 3 with the concentration of 0 moles and the volume of 0 L using titration. Calculation: To make the standard solution well need to work out how much Na 2 CO 3 well need First, we need to figure out how many moles of Na 2 CO 3 there is: C= 0 M V= 0 L N=? Using the number of moles and molar mass we can figure out how much Na 2 CO 3 we will need m = molar mass and n= number of moles n= 0. Mr = Mr of the addition of all elements from Na 2 CO 3 Na= 23x2 C= 12+O3=16x3= 105. m= mr x n m= 0 105= 1. C= n/V  n=CxV n=0 x 0 L n=0.

Evaluation First we should zero the balance with the empty weighing boat on top then we should transfer the Na 2 CO 3 we should keep the lid of the Na 2 CO 3 when it isn’t in use to prevent contamination of other substances. We only need enough water to dissolve the solute. And we need washout out our weighing boat with distilled water to ensure all the powder is transferred. When dissolving our solution in a volumetric flask it is critical that we use the correct amount of water, and we need to read from the bottom pf the meniscus. We should also wash out our glass stirring rod to make sure the solution is fully transferred. This is the second stage we added some distilled water to the sodium carbonate and started to mix it with a glass rod This is what our solution looked like after it was fully mixed This is what our solution looked like when we put the solution in a volumetric flask a added distilled water This was where we zeroed the scales and placed the weighing boat on the measure out the sodium carbonate

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Subject : Applied Science

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BTEC NQF L3 Applied Science: Unit 2: Assignment A: Colorimetry powerpoint

Subject: Chemistry

Age range: 16+

Resource type: Other

Last updated

22 February 2018

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A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.

BTEC NQF L3 Applied Science: Unit 2

Complete set of resources (powerpoints, student skills checklists and student help sheets) for Unit 2: Practical Scientific Procedures and Techniques. The following assignments and associated practicals are included: \- 2A: Keeping Up With the Standards 1 \- 2B: Keeping Up With the Standards 2 \- 2C: Separate to Identify \- 2D: How Am I Doing? These practicals are a requirement within the new Pearson BTEC Level 3 specification (Unit 2).

BTEC NQF L3 Applied Science: Unit 2: Assignment A

Powerpoints, student skill sheets and student help sheets for Assignment 2A: Keeping Up The Standards 1 for the following experiments: \- Standard Solution of 0.1M sodium carbonate. \- Titration 1 of 0.1M sodium carbonate against 0.4M hydrochloric acid (using pH probe). \- Titration 2 of 0.4M hydrochloric acid against 0.2M sodium hydroxide. \- Colorimetry of copper sulfate using a 1.0M standard solution. These practicals are a requirement within the new Pearson BTEC Level 3 specification (Unit 2 - Assignment A).

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This is excellent except the mass and concentrations are 10 times too high, we have done this successfully but to avoid unwanted precipitates as we have often found with copper sulfate and our washing powder. We made the solution up with 0.1 sulfuric acid instead of water.

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