Answer to Question #190021 in General Chemistry for Caylin Adams

Question #190021

Good day.

My question is as follows:

It is suspected that an acid-base titration method has a significant indicator error and thus tends to give results with a positive systematic error, i.e. a positive bias. To test this an exactly 0.1 M solution of HCl is used to titrate 20.00 mL of an exactly 0.1 M solution of NaOH and the following results were obtained 20.06, 20.18, 19.87, 20.51, 20.34, 20.41.

Test for positive bias in these results at 95% confidence level.

Please assist.

Expert's answer

An acid-base titration is an experimental procedure used to determined the unknown concentration of an acid or base by precisely neutralizing it with an acid or base of known concentration. This lets us quantitatively analyse the concentration of the unknown solution. Acid-base titrations can also be used to quantify the purity of chemicals.

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