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14 January, 19:44

What will happen to the ph of a solution of carbonic acid if sodium hydrogen carbonate is added?

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  1. 14 January, 23:40
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    when sodium hydrogen carbonate (NaHCO3) is added. The pH will increase, or become more basic.

    Explanation:

    Step 1: Data given

    The solution contains carbonic acid = H2CO3

    H2CO3 is a weak acid.

    We'll add sodium hydrogen carbonate = NaHCO3

    Step 2: What will happen to the pH

    When we add NaHCO3, there will be formed a buffer of H2CO3/HCO3-

    pH = pka+log ([A-]/[HA])

    pH = pka+log ([HCO3-]/[H2CO3])

    When NaHCO3 is added, [HCO3-] will be greater.

    When [HCO3-] will be greater, ([HCO3-]/[H2CO3]) will be greater

    When ([HCO3-]/[H2CO3]) will be greater, the pH will increase.

    This means when sodium hydrogen carbonate (NaHCO3) is added. The pH will increase, or become more basic.
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