A manufacturer has purified a batch of compound K. The accepted melting point of pure compound K is 154 ∘C154\ ^\circ\text{C}154 ∘C.
The batch was tested after purification.
| Observation | Temperature |
|---|---|
| The batch started to melt | 149 ∘C149\ ^\circ\text{C}149 ∘C |
| The batch had completely melted | 154 ∘C154\ ^\circ\text{C}154 ∘C |
The manufacturer claims that the batch must be pure because its melting range includes the accepted melting point.
Evaluate the manufacturer's claim. Give the melting result that would support the claim that the batch is pure.
113 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.