A student uses a miscalibrated graduated cylinder to measure the KI solution in
ID: 987195 • Letter: A
Question
A student uses a miscalibrated graduated cylinder to measure the KI solution in Part IIB. Each scale reading indicates a volume exactly 0.5mL greater than is actually the case (e.g., the cylinder reads 8.0mL when it actually contains only 7.5mL).
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 calculated for these determinations?
c) Which determination will be the most affected? Briefly explain.
Thank you :)
Explanation / Answer
If the graduated cyllinder measures 0.5 ml less than the actual volume in all the readings.
a) Actual volume = measured volume - 0.5 ml
b) Experimentally determined concentration will be higher than concentrations calculated
concentration = moles of solute/volume of solution
Thus, concentration is inversely proportional to volume of solution. As toyal volume of solution is lower by 0.5 ml than calculated volume, the concentration would be higher than caclulated value.
c) The lowest concentrations will be most affected by this miscalibration readings. Maximum error in low readings than higher volume and concentration readings.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.