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A 1.87 g sample of Mg reacts with 80.0 mL of an HCl solution whose pH...

A 1.87 g sample of Mg reacts with 80.0 mL of an HCl solution whose pH is -0.544. What is the pH of the solution after all the Mg has reacted? Assume constant volume.

Mg(s) + 2HCl(aq) --> MgCl2(s) + H2(g)

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