A student titrates nitric acid against potassium hydroxide solution. At the end point, one drop from the burette turns the solution in the conical flask from yellow to red.
Which indicator was used, and which solution was in the conical flask?
Methyl orange, with nitric acid in the flask
Methyl orange, with potassium hydroxide solution in the flask
Phenolphthalein, with nitric acid in the flask
Phenolphthalein, with potassium hydroxide solution in the flask
152 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.