Several students titrate 25.00 cm3 of the same solution of sodium hydroxide, NaOH(aq)\text{NaOH(aq)}NaOH(aq), with hydrochloric acid, HCl(aq)\text{HCl(aq)}HCl(aq).
One student obtains a larger titre than the other students.
Which procedure explains the larger titre?
The conical flask is rinsed with water before carrying out the titration.
The pipette is rinsed with water before filling with NaOH(aq)\text{NaOH(aq)}NaOH(aq).
The burette is rinsed with water but not with the HCl(aq)\text{HCl(aq)}HCl(aq) solution before filling.
The burette readings are taken from the top of the meniscus instead of the bottom of the meniscus.
5 exam-style questions on OCR A A Level Chemistry Use of apparatus and techniques. Each one has a worked solution and a mark scheme showing where the marks go.