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Generating hydrogen gas?

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To generate hydrogen gas, the following steps are taken:

1. Put zinc into a test tube.

2. Add dilute hydrochloric acid.

3. Add a few crystals of copper (II) sulphate.

What is the function of copper (II) sulphate in generating hydrogen gas?

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  1. i think it could be catalyst because the reaction is

    2HCl + 2Zn----->ZnCl2 + H2

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