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25 June, 07:20

Calculate the ph and the poh of an aqueous solution that is 0.030 m in hcl (aq) and 0.070 m in hbr (aq) at 25°c.

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  1. 25 June, 08:40
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    Solution:

    Since, both are strong acids. So both ionize 100% in solution.

    Let us consider that we have 1 liter of the solution. In it, we have 0.030 moles of H + (from the HCl) and 0.070 moles of H + (from the HBr) for a total of 0.100 mole in 1 liter. Here we ignore the chloride ion and the bromide ion since both acids ionize 100%. The only important ion (for pH) is the H+.

    In terms of just the H+, this is 0.100 M

    pH = - log 0.100 = 1.000

    And

    pH + pOH = 14.000

    -1.000+14.000=13.000

    Therefore,

    pOH = 13.000
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