7. A student uses a miscalibrated graduated cylinder to measure the KI solution

Question

7. A student uses a miscalibrated graduated cylinder to measure the KI solution in Part IIB. Each scale reading indicates a volume exactly 0.5 ml greater than is actually the case (eg, the cylinder reads 8.0 mL when it actually contains only 75 mL). (a) What actual volumes will be measured for each of determinations 5-8 (b) How will the experimentally determined concentrations compare to the concentrations you cal- culated for these determinations? (c) Which determination will be the most affected? Briefly explain.

Explanation / Answer

Determination number
      actual volume
5           7.5
6           3.5
7           1.5
8           0.5
The volume of KI will be more than actual so the volume of Na2S2O3 reacting with KI will be different from what calculated. Hence the concentration will not be the same as obtained.
c) The experiment details are required

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