You suspect that you overshot the endpoint of the titration (or added too much N

Question

You suspect that you overshot the endpoint of the titration (or added too much NaOH solution in your first attempt at titrating the KHP with NaOH.) Since the calculations are simple you go ahead and calculate the concentration of NaOH for this first titration along with the values for later titrations. When the concentration of your suspect (overshot) value is compared to the concentration values of the rest of your titrations what would you look for in the calculated concentration to confirm your suspicion of having overshot the end point?

Please explain WHY. I think it would be too high of a concentration?

Explanation / Answer

We are calculating the strength of the NaOH solution by titrating the NaOH solution against a standard Acid (like HCl) solution. The calculating formula is

       MNaOH = (VHCl * MHCl) / VNaOH

The overshot volume of NaOH is V'NaOH which is greater than VNaOH.

So, M'NaOH will be lower than that of the actual strength. The error will be negative in nature.

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