BTEC APPLIED SCIENCE UNIT 2 AIM A practical scientific procedures and techniques

BTEC APPLIED SCIENCE UNIT 2 AIM A practical scientific procedures and techniques BTEC Assignment Brief Qualification Pearson BTEC Level 3 National Certificate in Applied Science Pearson BTEC Level 3 National Extended Certificate in Applied Science Pearson BTEC Level 3 National Foundation Diploma in Applied Science Pearson BTEC Level 3 National Diploma in Applied Science Pearson BTEC Level 3 National Extended Diploma in Applied Science Unit number and title Unit 2: Practical Scientific Procedures and Techniques Learning aim(s) (For NQF only) A: Undertake titration and colorimetry to determine the concentration of solutions. Assignment title Concentrate on keeping up your standards Assessor Carol Ezeji Issue date 27/04/2022 Hand in deadline Grp3: 11/05/2022 Grps1&2: 13/05/2022 Vocational Scenario or Context You are a newly appointed technical assistant at a large chemical plant, Camden Chemcalequip. As part of your induction period and to progress in your role, you have to demonstrate skills in a range of practical procedures and techniques. Part of your role is to ensure equipment is calibrated and equipment and chemicals are safety checked. A key part of your job will be making and testing standard solutions using titration and colorimetry procedures. You must demonstrate your ability to carry out these techniques skilfully and accurately. Evidence of your practical skills, along with your results, calculations, evaluation of the techniques and possible improvements will need to be submitted in a report(s). Task 1 Evaluate the accuracy and safety of the following quantitative procedures and techniques in relation to their outcomes. Your practical work must be undertaken correctly and safely at all times. Your techniques will need to be performed to a high degree of accuracy and precision in order to obtain reliable and valid outcomes. You will be observed performing your preparation of solutions, calibration of equipment and application of titration and colorimetry techniques. Downloaded by kelvin githinji () lOMoARcPSD| Titration:  You will perform different titrations to accurately and skilfully determine the concentration of a solution of sodium hydroxide.  You will first need to calibrate the equipment that you will use for these titrations which will include: the pipette, the weighing balance and the pH meter (using buffer solutions).  Your practical work will involve three stages: o Preparation of a primary standard solution of Na2CO3 by weighing the solid, using the calibrated weighing balance, mixing and dissolving in water, and making up the solution to an accurate volume o Accurate standardisation of a given concentration of hydrochloric acid (HCl) by titration with your primary standard solution of Na2CO3 and using the calibrated pipette o Titration of the sodium hydroxide (NaOH) solution of unknown concentration with the standardised HCl  You must use two different titration techniques in your determination of the concentration of sodium hydroxide (NaOH): o by use of an appropriate indicator to determine the end point o by use of the calibrated pH meter to monitor the pH change before, during and after the end point  You must produce accurate, precise and reliable results from both techniques  You must calculate the concentration of NaOH solution: o directly from your recorded results, in the titration technique using the indicator o by plotting and using a graph of pH against volume of HCl, in the titration technique using the pH meter Colorimetry:  You will use a colorimeter (or visible spectrometer) to accurately and skilfully determine the concentrations of Sample A and B, which are two different concentrations of copper(II) sulfate (CuSO4) solution that you will be provided with.  Your practical work will involve: o Preparing your own known concentration of CuSO4 solution by weighing hydrated copper(II) sulfate solid (CuSO4.5H2O), dissolving in water and making up to an accurate volume o Accurately dilute your stock CuSO4 solution to produce a series of CuSO4 standard solutions of different concentrations o Select an appropriate filter / wavelength for the colorimeter or visible spectrometer that you will use to measure the absorbance (or transmission) of the