A student carries out a titration to find the exact volume of dilute nitric acid needed to neutralise 20.0 cm3 of sodium hydroxide solution, using methyl orange indicator.
To obtain a pure, dry sample of solid sodium nitrate, the student repeats the reaction by mixing the same exact volumes of the acid and alkali, but this time without adding the indicator. They then evaporate the water from this new mixture.
Explain why the student must prepare this new mixture without the indicator, rather than evaporating the mixture from the titration, to obtain a pure sample of solid sodium nitrate.
Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 276 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.
