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March 26, 2017

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1L soulution has a pH of 6
how many OH- would it tak eto make it a pH7 solution?

  • chemistry - ,

    pH = 6 = (H^+) = 1 x 10^-6M and OH^- = 1 x 10^-8
    You want pH = 7 = (H^+) = 1 x 10^-7 and OH^- = 1 x 10^-7

    In 1 L you have 1 x 10^-8 moles and you want 1 x 10^-7 moles so you must add
    1 x 10^-7 - 1 x 10^-8 = 9 x 10^-8 mols and that times 6.022 x 10^23 OH^- ions/mole = number of OH ions to add. Check my thinking. Check my arithmetic.

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