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Purity and separating mixtures

Purity and separating mixtures

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Question 17

An analytical chemist investigates the purity of four different organic samples that may contain salicylic acid. The literature melting point of pure salicylic acid is 159∘C159^\circ\text{C}159∘C.

SampleMelting point range (∘C)P159Q148−155R135S162−165 \begin{array}{|c|c|}\hline \textbf{Sample} & \textbf{Melting point range } (^\circ\text{C}) \\ \hline \text{P} & 159 \\ \hline \text{Q} & 148 - 155 \\ \hline \text{R} & 135 \\ \hline \text{S} & 162 - 165 \\ \hline \end{array} SamplePQRS​Melting point range (∘C)159148−155135162−165​​

Which statement is correct?

A

Sample R is impure salicylic acid.

B

Sample S is salicylic acid containing a small amount of impurity.

C

Sample Q is impure salicylic acid.

D

All four samples contain salicylic acid.

Markscheme

Purity and separating mixtures Questions

  1. GCSE
  2. /Chemistry
  3. /Purity and separating mixtures

46 exam-style questions on OCR GCSE Chemistry Purity and separating mixtures. Each one has a worked solution and a mark scheme showing where the marks go.

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