What would happen to your final RCl answer if the student makes the following changes:
a) The student over-titrated the unknown chloride solid with the standard AgNO3.
b) The student dissolved the unknown chloride solid in 100 mL of RO water instead of the 25 mL as indicated in the procedure.
c) The student spilled some of the unknown chloride solid after weighing and before titrating, but used the original mass calculations.
d) After the titration run, the student recorded the final buret reading as 19.77 mL instead of the correct reading of 18.77 mL.
e) The student recorded the molarity of the standard AgNO3 in their data as 0.05442 M instead of the correct concentration of 0.05028 M.

Question

High School

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Answer :

The final RCl answer would be affected by over-titration, dilution, spillage, incorrect buret reading, and inaccurate molarity recording of AgNO3.

The final RCl answer would be affected by the following changes:

If the student over-titrated the unknown chloride solid with the standard AgNO3, it would result in an artificially higher RCl answer due to excess AgNO3 used.
If the student dissolved the unknown chloride solid in 100 mL of RO water instead of the specified 25 mL, it would result in a lower RCl answer since the concentration of the chloride would be diluted.
If the student spilled some of the unknown chloride solid after weighing and before titrating, but used the original mass calculations, it would result in an artificially higher RCl answer because the actual amount of chloride used would be less.
If the student recorded the final buret reading as 19.77 mL instead of the correct reading of 18.77 mL, it would result in an artificially higher RCl answer since more AgNO3 would be recorded as used.
If the student recorded the molarity of the standard AgNO3 as 0.05442 M instead of the correct concentration of 0.05028 M, it would result in an artificially higher RCl answer due to an overestimated AgCl concentration.