pH and pOH scale; Simple calculations - Jamb Chemistry Past Questions and Answers

Question 6:

• JAMB 1986

Which of the following salts when dissolved in water will NOT give the corresponding pH value?

A. NaHSO₄, pH < 5
B. Na₂CO₃, pH > 8
C. Na₂Cl,pH = 7
D. NaHCO, pH < 6

Question 7:

• JAMB 1988

Which of the following dilute solutions has the lowest pH value?

A. Calcium trioxocarbonate (IV)
B. Sodium trioxocarbonate (IV)
C. Hydrochloric acid
D. Ethanoic acid

Question 8:

• JAMB 1991

Which of the following equimolar solutions, Na₂CO₃ Na₂ SO₄CI FeCI₃ CH₃COONa,
have pH greater than 7?

A. FeCI ₃ and NH ₄CI
B. Na₂CO₃, CH₃COONa and Na,Na₂SO₄
C. Na₂CO₃ and CH₃COONa
D. FeCI₃, CH₃COONa and NH₄CI

Question 9:

• JAMB 1992

A sample of orange juice is found to have a pH of 3.80. What is he concentration of the hydroxide ion in the juice?

A. 1.6 x 10^-4
B. 6.3 x 10^-11
C. 6.3 x 10^-4
D. 1.6 x 10^-11

Question 10:

• JAMB 1993

A student prepares 0.5 M solution each of hydrochloric and ethanoic acids and then measured pH. The result would show that the?

A. PH values are equal
B. HCI solution has a higher pH
C. Sum of the values is 14
D. Ethanoic acid solution has a higher pH