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Titrimetric Methods of Analysis Quiz

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Questions and Answers

What is the chemical substance being analyzed in the example given?

Water
Sodium hydroxide
Sodium chloride
Hydrochloric acid (correct)

What is the definition of titrimetric methods of analysis?

Analytical methods in which the volume of a solution of known concentration is consumed during the analysis.
Analytical methods that use a chemical indicator to determine the endpoint of a titration.
Analytical methods in which the amount of active constituent in a sample is measured by the volume of a titrant solution of known concentration. (correct)
Analytical methods that measure the amount of a substance by the addition of a titrant solution until an equivalence point is reached.

What is the difference between the stoichiometric point and the end point of a titration?

The stoichiometric point is the point where equivalent amounts of analyte and titrant have reacted, while the end point is the point where a sudden change in the reaction mixture is observed. (correct)
The stoichiometric point is the point where the titration begins, while the end point is the point where the titration ends.
The stoichiometric point and the end point are the same, as they both represent the point where equivalent amounts of analyte and titrant have reacted.
The stoichiometric point is the point where the titration is stopped, while the end point is the theoretical point where equivalent amounts of analyte and titrant have reacted.

What is the purpose of the indicator used in the titration?

To change the color of the reaction mixture at the equivalence point. (C) Signup and view all the answers

What is the purpose of the buret used in a titration?

To add the titrant solution in a controlled and measured manner. (A) Signup and view all the answers

What is the relationship between the analyte and the titrant in a titration?

The analyte and titrant react in a 1:1 stoichiometric ratio. (D) Signup and view all the answers

What is the main purpose of a titration?

To determine the concentration of an unknown solution (D) Signup and view all the answers

What is the difference between a direct titration and a residual titration?

Direct titrations involve a single reaction, while residual titrations involve two reactions. (C) Signup and view all the answers

Why is it convenient to use equivalents in titrimetric analysis?

Equivalents allow you to directly relate the amounts of reactants and products in a chemical reaction. (D) Signup and view all the answers

What is the relationship between the amount of a substance in grams and its equivalent amount?

The number of equivalents is equal to the number of moles divided by the substance's formula weight. (C) Signup and view all the answers

How are the results of drug assays typically expressed?

In terms of %w/w, %w/v, and %v/v. (A) Signup and view all the answers

What is the main reason that titrations are only feasible when the end point is very close to the theoretical stoichiometric point?

To minimize the error in the calculated analyte concentration. (C) Signup and view all the answers

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