A sample of potassium nitrate is contaminated with a small amount of sodium nitrate. When a flame test is carried out on this sample, the intense yellow flame of the sodium masks any other flame colour.
Describe how a chemist could show that both potassium ions (K+\text{K}^+K+) and sodium ions (Na+\text{Na}^+Na+) are present in this sample.
Practise Edexcel GCSE Chemistry Qualitative analysis: tests for ions with exam-style questions for Foundation and Higher tier. 127 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.
