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29 August, 02:42

A solution of naoh (aq) contains 11.6 grams of naoh in 129 ml of solution. calculate the ph at 25◦c.

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  1. 29 August, 02:50
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    First, we need to determine the number of moles of NaOH:

    n (NaOH) = m/M = 11.6/40 = 0.29 mole

    Then, the concentration of NaOH solution can be calculated:

    c (NaOH) = n/V = 0.29/0.129 = 2.25 mol/L

    The concentrations of NaOH and OH⁻ ions are equal, so we can determine pOH:

    pOH = - log[OH⁻] = - log2.25 = - 0.35

    Finally, pH value is:

    pH + pOH = 14

    pH = 14 - (-0.35) = 14.35
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