![]() ![]() Add about 5 cm 3 of sulfuric acid and shake to mix thoroughly.Put 10 drops of potassium chromate(VI) solution in a test tube.Dilute sulfuric acid, H 2SO 4(aq), (IRRITANT) – see CLEAPSS Hazcard HC098a and CLEAPSS Recipe Book RB098.Sodium hydroxide solution, NaOH(aq) (CORROSIVE) – see CLEAPSS Hazcard HC091a and CLEAPSS Recipe Book RB085.Potassium chromate(VI) solution, K 2CrO 4(aq) (TOXIC, OXIDISING, DANGEROUS FOR THE ENVIRONMENT) – see CLEAPSS Hazcard HC078a and CLEAPSS Recipe Book RB069.Wear eye protection (goggles) throughout.Read our standard health and safety guidance.Dilute sulfuric acid, 1.0 M (IRRITANT), about 5 cm 3.Sodium hydroxide solution, 1.0 M (CORROSIVE), about 10 cm 3.Potassium chromate(VI) solution, 0.2 M (TOXIC, OXIDISING, DANGEROUS FOR THE ENVIRONMENT), about 1 cm 3.It should take no more than five minutes. The experiment can be carried out individually by students, but the potassium chromate(VI) solution used should be prepared beforehand by the teacher or technician, given the hazards presented by the solid. Otherwise it could be carried out as a teacher demonstration. The experiment is most appropriate with A-level students, given the potential hazards with solutions containing chromate(VI) and dichromate(VI) ions. ![]() They observe the resulting colour changes, before reversing the reaction using aqueous sodium hydroxide. In this experiment, students add dilute sulfuric acid to an aqueous solution of potassium chromate(VI). RSC Yusuf Hamied Inspirational Science Programme.Introductory maths for higher education.The physics of restoration and conservation. ![]()
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