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14 August, 14:26

Hclo is a weak acid (ka=4.0x10^-8) and so the salt naclo acts as a weak base. what is the ph of a solution that is 0.037 m in naclo at 25 c

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  1. 14 August, 17:37
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    Given:

    Concentration of NaClO = 0.037 M

    ka (HClO) = 4.0*10⁻⁸

    To determine:

    The pH of the NaClO solution

    Explanation:

    The hydrolysis of the weak base can be represented by the ICE table shown below-

    ClO - + H2O ↔ HClO + OH-

    Initial 0.037M 0 0

    Change - x + x + x

    Equilibrium (0.037-x) x x

    kb = kw/ka = [HClO][OH-]/[ClO-]

    10⁻¹⁴/4*10⁻⁸ = x² / (0.037-x)

    x = [OH-] = 9.62*10⁻⁵

    p[OH-] = - log[OH-] = - log [9.62*10⁻⁵] = 4.02

    pH = 14-p[OH-] = 14 - 4.02 = 9.98

    Ans: pH of the solution is 9.98
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