A hospital laboratory uses flame emission spectroscopy, rather than flame tests, to detect potassium ions in blood samples. A scientist explains that flame emission spectroscopy is more sensitive than a flame test.
What does 'more sensitive' mean in this context?
It gives each result quickly, so many blood samples can be analysed every day.
It gives a result that does not depend on a person judging a flame colour.
It identifies the negative ions in the blood as well as the potassium ions.
It can detect amounts of potassium ions far too small to give a visible flame colour.
107 exam-style questions on OCR GCSE Chemistry 4.2 Identifying the products of chemical reactions, covering 4.2.1 Tests to identify gases, 4.2.2 Tests for aqueous ions and flame tests, and 4.2.3 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.