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Question: after the first trial in order to maximize the titration...

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After the first trial, in order to maximize the titration precision, the sample size of pure KHC8H4O4 or unknown for a trial should be adjusted so 20-23 mL of NaOH are delivered in both part B and C. This can be done as noted on page 82 in your lab manual.
If 6.61 mL NaOH was used in the titration of a 0.663 g sample use ratios to determine mass of sample needed to use 20.50 mL of NaOH in the next trial.

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