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

Question 21:

• JAMB 2012

Which of the following will produce a solution with pH less than 7 at equivalent point?

A. HNO ₃ +NaOH
B. H ₂SO ₄ + KOH
C. HC +Mg (OH) ₂
D. HNO ₃ + KOH

Question 22:

• JAMB 2013

Three drops of a 1.0 mol dm^-3 solution of HCl was added to 20 cm³ of a solution of pH6.4. The pH of the resulting solution will be

A. Close to that of pure water
B. Less than 6.4
C. Greater than 6.4
D. Unaltered

Question 23:

• JAMB 2014

The mathematical expression of PH is

A. Log ₁₀[OH^-]
B. Log ₁₀1/[H ₃ O⁺]
C. Log ₁₀[H ₃ O⁺]
D. Log ₁₀1/[OH ^-]

Question 24:

• JAMB 2015

what is the pH of 0.00lmoldm³ solution of sodium hydroxide

A. 14
B. 13
C. 12
D. 11

Question 25:

• JAMB 2017

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

A. 1.6 \(\times\) 10^-4
B. 6.3 \(\times\) 10^-11
C. 6.3 \(\times\) 10^-4
D. 1.6 \(\times\) 10^-11