This is from a lab. The dropped used to deliver drops of DCP only delivers whole

Question

This is from a lab.

The dropped used to deliver drops of DCP only delivers whole drops. For example, if the color change was observed after addition of 11th drop, we know that 10 drops weren't sufficient. In that example, 10.1 drops might have reached the required reaction stoichiometry & the 11 drops was more than required.

Since 11 drops could have been up to 1 full drop past the equivalence point, the uncertainty in the measurement is 1 drop out of 11, or 1/11th , or 9%. For an endpoint observed after 20 drops were added, the percentage uncertainty would be 1/20 or 5%.

Calculate the percentage uncertainty in finding the equivalence point for DCP addition in each of the three titrations.

A - % error in DCP for standard = ? %   (17 drops were added)

B- % error in DCP for drink = ? %         (11 drops were added)

C - % error in DCP for juice = ? %      (19 drops were added)

Explanation / Answer

A= % error in DCP for standard =1/17*100=5.9%

B- % error in DCP for drink =1/11*100=9%

- % error in DCP for juice = 1/19*100=5.3%

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