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20 November, 14:29

1. Formic acid, HFor, has a Ka value of 1.8x10-4.

a) What is the pH range of a formic acid (HFor) - sodium formate (NaFor) buffer system?

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  1. 20 November, 16:55
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    pH range = 2.74-4.74

    Explanation:

    The pH range of a buffer falls in between one unit on either side of pKa.

    The given weak acid is HF and its Ka = 1.8X10⁻⁴

    pKa = - log (Ka)

    pKa = - log (1.8X10⁻⁴)

    pKa = 3.74

    The pH range is 3.74-1 = 2.74 to 3.74+1 = 4.74

    pH range = 2.74-4.74
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