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AQA A level Chemistry Practicals Exam 2025 Questions and Answers Describe how to make a standard solution - --CORRECT ANSWER--1. Accurately weigh out the sample using a high precision balance. 2. Transer the sample to a beaker and reweigh the weighing boat to determine the mass transferred. 3. Dissolve the sample in a small volume of distilled water and stir with a glass rod. 4. Transfer the solution into a volumetric flask. 5. Rinse all equipment and transfer all rinsings into the flask. 6. Add deionised water up to calibration line(however much of the standard solution ur tryna make e.g. 250cm3) using a dropping pipette at the end. 7. Invert the solution to homogenise solution. Describe how to determine the concentration of an unknown solution of acid using a known conc solution of base. - --CORRECT ANSWER--1. Rinse the burette with the base solution to remove any impurities. ....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1