Question 1

Which of the following best describes the role of the titrant in a titration experiment, as illustrated in the first image?

Accepted Answer

The titrant is the solution of known concentration added from the burette to react with the analyte.

Question 2

In the titration process shown in the first image, what does the color change in the conical flask indicate?

Accepted Answer

The equivalence point has been reached, meaning stoichiometric amounts of titrant and analyte have reacted.

Question 3

Which of the following statements about the complex shown in the second image is correct?

Accepted Answer

The central atom is a metal ion (Mn) surrounded by ligands forming a complex.

Question 4

Which property of EDTA makes it especially useful as a titrant in complexometric titrations?

Accepted Answer

It forms strong, stable complexes with metal ions, especially those with higher charges.

Question 5

A student titrates 25.0 mL of a hydrochloric acid solution with 0.100 mol dm$$^{-3}$$ NaOH. The equivalence point is reached after adding 30.0 mL of NaOH. What is the molarity of the HCl solution? Use the equation: $$M_A V_A = M_B V_B.$$

Accepted Answer

$$0.0833$$ mol dm$$^{-3}$$

Question 6

Which of the following is NOT a requirement for a reaction to be suitable for titrimetric analysis?

Accepted Answer

The reaction should be reversible.

Question 7

In a redox titration, which of the following best describes the role of the oxidizing agent?

Accepted Answer

It accepts electrons and is itself reduced.

Question 8

Which of the following is a suitable primary standard for standardizing a sodium hydroxide solution?

Accepted Answer

Potassium acid phthalate

Question 9

A titration curve shows a rapid pH change near the equivalence point and the equivalence point occurs at pH $$\u003e7. $$Which combination of acid and base does this most likely represent?

Accepted Answer

Weak acid and strong base

Question 10

Which indicator would be most suitable for the titration of acetic acid (a weak acid) with sodium hydroxide (a strong base)?

Accepted Answer

Phenolphthalein

Question 11

A 1.00 g sample of vinegar is titrated with 0.100 mol dm$$^{-3}$$ NaOH and requires 28.8 mL to reach the endpoint. What is the percentage of ethanoic acid in the vinegar? (Molar mass of CH$$_3$$COOH = 60.0 g mol$$^{-1})$$

Accepted Answer

17.3%

Question 12

Which of the following best describes the function of an indicator in a titration?

Accepted Answer

It signals the end point of the titration by changing color.

Question 13

Which of the following is a correct balanced half-equation for the reduction of permanganate in acid solution?

Accepted Answer

$$\mathrm{MnO_4^- + 8H^+ + 5e^- \rightarrow Mn^{2+} + 4H_2O}$$

Question 14

Which of the following is a common interference in the permanganate titration of iron(II) in acid solution?

Accepted Answer

Chloride ions

Question 15

In a precipitation titration using silver nitrate to determine chloride, which indicator is commonly used and what is the observed color change?

Accepted Answer

Potassium chromate, yellow to red

Question 16

Which of the following best describes the difference between precision and accuracy in chemical analysis?

Accepted Answer

Precision is the closeness of repeated measurements to each other; accuracy is the closeness of a measurement to the true value.

Question 17

Which of the following is NOT a type of chemical analysis described in the study materials?

Accepted Answer

Chromatographic analysis

Question 18

A solution contains 0.346 g of KCl dissolved in water to make 50 mL of solution. What is the concentration in g dm$$^{-3}$$?

Accepted Answer

6.92 g dm$$^{-3}$$

Question 19

Which of the following best describes the role of a ligand in a complexometric titration?

Accepted Answer

A ligand is a molecule that binds to a metal ion to form a complex.

Analytical Chemistry: Titrimetric Methods and Calculations

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