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26 December, 20:53

When excess solid mg (oh) 2 is shaken with 1.00 l of 1.3 m nh4cl solution, the resulting saturated solution has ph=9.10?

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  1. 26 December, 23:07
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    Missing question: calculate concentration of OH⁻ ion.

    Chemical reaction: Mg (OH) ₂ + 2NH₄Cl → MgCl₂ + 2NH₄OH.

    pH = 9.10.

    [H+] = 10∧ (-pH).

    [H+] = 10∧ (-9.10).

    [H+] = 7.94·10⁻¹⁰ M.

    [H+] · [OH⁻] = 10⁻¹⁴ M².

    [OH⁻] = 10⁻¹⁴ M² : 7.94·10⁻¹⁰ M.

    [OH⁻] = 1.25·10⁻⁵ M.
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