During a titration, a student slowly adds dilute hydrochloric acid to a beaker containing a solution of potassium hydroxide, causing the pH of the mixture to decrease from 13 to 2.
If phenolphthalein indicator is added at the start of the experiment, state the colour change that is observed.
Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.