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17 October, 05:56

What is the pH of a solution that contains 25 grams of hydrochloric acid (hcl) dissolved in 1.5 liters of water?

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  1. 17 October, 06:18
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    First we calculate the concentration of HCl:

    Moles = mass / Mr

    = 25 / 36.5

    = 0.685 mol

    Concentration = 0.685/1.5 = 0.457 mol / dm³

    For a strong monoprotic acid, the concentration of hydrogen ions is equal to the acid concentration.

    pH = - log[H+]

    pH = - log (0.457)

    = 0.34
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