Estimating the mass of sample needed to optimize precision After the first trial

Question

Estimating the mass of sample needed to optimize precision After the first trial, in order to maximize the titration precision, the sample size of pure KHCgH404 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 notec on page 82 in your lab manual If 9.70 mL NaOH was used in the titration of a 0.694 g sample use ratios to determine mass of sample needed to use 22.00 ml of NaOH in the next trial. L Submit Answer Tries 0/99 )One reason for using more than 20 mL of NaOH solution in the titration is to make sure that there are 4 significant figures Submit Answer Tries 0/99

Explanation / Answer

if 9.7 mL --> 0.694 g

then

22 mL --> x

x = 22/9.7*0.694

x = 1.5740 g required

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