weak acid – weak base titration

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This topic contains 1 reply, has 0 voices, and was last updated by  Natthe 10th May 2018 at 5:45 pm.

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    I have done a couple of titrations of acetic acid with sodium bicarbonate and sodium carbonate. I am adding solid salts of each to 3% acetic acid. I know this isn’t standard, but I was asked to do it this way. My curves look good, but when I later add the required amount of base (all at once, to a new container of 3% acetic acid) to reach the equivalence point, the pH is always about 0.5 below what is expected from the curves. I think this is because my scales aren’t accurate when measuring small amounts of salt. 

    Question: Is there a way to analytically determine the amount of sodium bicarbonate needed to neutralize 1L of 1% acetic. I know how to do this with a strong base, but not for weak ones, and I would like to determine how inaccurate my experiments are.

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