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20 October, 13:14

A solution contains. 36 g sodium hydroxide in 500 ml what is the ph

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  1. 20 October, 13:25
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    NaOH is a strong base therefore complete dissociation takes place.

    number of NaOH moles dissolved - 0.36 g / 40 g/mol = 0.009 mol

    Concentration of NaOH - 0.009 mol / 0.5 L = 0.018 M

    molar ratio of NaOH to OH⁻ is 1:1, therefore [NaOH] = [OH⁻]

    pOH = - log [OH⁻]

    pOH = - log (0.018)

    pOH = 1.74

    pH + pOH = 14

    pH = 14 - 1.74

    pH = 12.26
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