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25 October, 07:45

Calculate the ratio of ch3nh2 to ch3nh3cl required to create a buffer with ph = 10.22.

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  1. 25 October, 09:40
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    When the Ka value for CH3NH2 = 2.27 x 10 ^-11

    and when we have the Ka value so, we can get Pka from this formula:

    Pka = - ㏒Ka

    ∴Pka = - ㏒ (2.27 x10^-11)

    = 10.6

    now, to get the base/acid ratio by using Henderson-Hasselblach equation:

    PH = Pka + ㏒[base/acid]

    so by substitution:

    10.22 = 10.6 + ㏒[base/acid]

    ∴[base/acid] = 0.417

    ∴[CH3NH2/CH3NH3Cl] = 0.417
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