A student standardises a solution of sodium hydroxide by adding it from a burette into a conical flask containing dilute hydrochloric acid and a few drops of indicator.
Which of the following correctly describes the indicator and the colour change observed in the conical flask at the end point of this titration?
Phenolphthalein | Pink to colourless
Methyl orange | Yellow to red
Phenolphthalein | Colourless to pink
Methyl orange | Red to blue
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.