A student reacts a pellet of calcium with an excess of dilute sulfuric acid to prepare hydrogen gas.
calcium (s)+sulfuric acid (aq)→calcium sulfate (s)+hydrogen (g) \text{calcium (s)} + \text{sulfuric acid (aq)} \rightarrow \text{calcium sulfate (s)} + \text{hydrogen (g)} calcium (s)+sulfuric acid (aq)→calcium sulfate (s)+hydrogen (g)Although bubbles of hydrogen gas are produced initially, the reaction rapidly slows down and stops, leaving a large portion of the calcium pellet unreacted at the bottom of the flask.
Explain why the reaction stops so quickly, referring to the physical state and properties of the calcium sulfate product.
Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 276 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.
