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.