An analytical chemist is testing a sample of industrial wastewater to confirm the presence of dissolved sulfate ions (SO42−\text{SO}_4^{2-}SO42−).
Complete Step 2 of the three-step chemical method used to identify sulfate ions.
Step 1: Add a small volume of dilute hydrochloric acid to the sample solution in a clean test tube.
Step 2: ....................................................................................................
Step 3: Observe the mixture to see if a dense white precipitate forms.
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.