Question

Select ALL the situation(s) (not just those occurring in this experiment) where a quantitative transfer is required.

a. In earlier experiments, transfer of KHP to the analyte flask for standardization of NaOH.
b. In this experiment, transfer of Na2CO3 from the analytical balance to the analyte flask for standardization of HCl.
c. In earlier experiments, pipetting an aliquot from a solution of known concentration to a volumetric flask for preparation of a diluted solution of known concentration.
d. In this experiment, transfer of 5.0 mL of saturated borax solution from the graduated cylinder to the analyte flask prior to titration.

Answer 1

The quantitative transfer is crucial in scenarios (a), (b), and (c), where precise amounts are required for stoichiometric calculations in chemical analysis such as titrations and gravimetric analysis.

Step-by-step explanation:

Situations where a quantitative transfer is required include:

• (a) Transfer of KHP to the analyte flask for standardization of NaOH.
• (b) Transfer of Na2CO3 from the analytical balance to the analyte flask for standardization of HCl.
• (c) Pipetting an aliquot from a solution of known concentration to a volumetric flask for preparation of a diluted solution of known concentration.

These situations demand precision and accuracy to ensure the correct stoichiometry is maintained in chemical reactions for quantitative chemical analysis, such as titrations and gravimetric analysis. In contrast, (d) transfer of 5.0 mL of saturated borax solution from the graduated cylinder to the analyte flask before titration may not require such precision, as it can be argued that volumetric glassware should be used for titration to ensure accuracy.