25-minute Test Part IV Acids and Bases

Which of the following statements about 100 cm³ of 1.0 M CH₃COOH(aq) is correct?

• A. It does not contain OH⁻(aq).

• B. Less than 0.10 mol of NaOH(aq) is needed to completely neutralize it.

• C. It reacts with NH₃(aq) to give salt only.

• D. It has a pH of 0.

Which of the following acids contains the largest amount of H⁺(aq) ions?

• A. 4 cm³ of 0.7 M sulphuric acid

• B. 10 cm³ of 0.5 M nitric acid

• C. 20 cm³ of 0.3 M hydrochloric acid

• D. 40 cm³ of 0.2 M ethanoic acid

25.0 cm³ of 0.1 M sodium hydroxide solution is titrated against 0.2 M nitric acid. Which of the following apparatus should be rinsed with distilled water and then with 0.2 M nitric acid before the titration?

(1) Pipette

(2) Burette

(3) Conical flask

• A. (1) only

• B. (2) only

• C. (1) and (3) only

• D. (2) and (3) only

Consider the four solutions. Which of the following statements about the solutions is correct?

• A. R and S have the same pH.

• B. When mixing Q and R, HCl(aq) is in excess.

• C. Q has a greater pH than P.

• D. When mixing P and R, a neutral solution is produced.

A sample of an acid has a pH of 3.0. 200 cm³ of the sample is diluted to 400 cm³ by adding distilled water. What is the pH of the diluted sample?

• A. 1.5

• B. 2.7

• C. 3.3

• D. 6.0

The diagram shows the set-up used in a titration between ethanoic acid and sodium hydroxide solution. Which of the combinations about indicator X and its colour change at the end point is correct?

• A

• B

• C

• D

Which of the following, when added to 1 M hydrochloric acid, would NOT change the pH of the acid?

• A. Distilled water

• B. 1 M sulphuric acid

• C. 1 M nitric acid

• D. 1 M ethanoic acid

In a titration experiment, 40 cm³ of 0.5 M hydrochloric acid is added from a burette, 2.00 cm³ at a time, to 25 cm³ of 0.5 M sodium hydroxide solution. The temperature of the reaction mixture is recorded immediately after each addition of the acid. Which of the graphs correctly shows the relationship between the temperature of the reaction mixture and the volume of hydrochloric acid added?

• A

• B

• C

• D

5.10 g of potassium hydrogenphthalate (C₈H₅O₄K) is dissolved in distilled water and made up to a 250.0 cm³ solution. 25.0 cm³ of the potassium hydrogenphthalate solution is titrated against 0.150 M sodium hydroxide solution. What is the volume of sodium hydroxide solution required for complete reaction?

(Molar mass of C₈H₅O₄K = 204.1 g mol⁻¹)

• A. 16.7 cm³

• B. 25.0 cm³

• C. 33.4 cm³

• D. 37.5 cm³

Both acids X and Y are strong monobasic acids. 50.0 cm³ of 0.20 M acid X is mixed with 75.0 cm³ of 0.60 M acid Y. 40.0 cm³ of 0.40 M HCl(aq) is then added to the mixture. What is the pH of the resultant mixture?

• A. 0.25

• B. 0.37

• C. 0.43

• D. 0.84