For the solid unknown titration in this experiment, would the following errors c

Question

For the solid unknown titration in this experiment, would the following errors cause the equivalent mass determined to be (A) too large, (B) too small, (C) no effect, or (D) not enough information to answer. Assume that the mistake given is the only mistake made in the experiment. Explain. The beret is rinsed with distilled water, but not NaOH solution before the solid unknown is titrated. The endpoint is too pink during standardization of the NaOH solution. The endpoint is too pink during titration of the solid unknown. Too much water is added to the solid unknown before titration. Titration is carried out with air in the tip of the burette.

Explanation / Answer

You need to rinse with base solution, it is not enough to rinse the buret with distilled water
The volume of the base will end with correction i.e) lower than actual value hence equivalent mass
will be too low

MaVa = MbVb
During the standardization of NaOH , if the endpoint is too pink then that indicates
that you added more volume of acid even after the end point is reached
Therefore it will give you a increased value of molarity of base which means
it will cause significant increase in equivalent mass, A

If the endpoint is too pink while titrating unknown , it is the same case as above
that is A

If too much water is added then your end point will increase which means your
equivalent mass value will be too small ,B

You won't be able see a significant change in your equivalent mass because the air at the
tip of buret will account to not more than 1mL, C

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