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

Question 11:

• JAMB 1994

A few drops of concentrated PCI are added to about 10cm³ of a solution of pH 3.4. The pH of the resulting mixtures is?

A. Less than 3.4
B. Greater than 3.4
C. Unaltered
D. The same as that of pure water

Question 12:

• JAMB 1995

The option above shows the PH changes for the titration of a

A. Strong acid versus strong base
B. Weak acid versus strong base
C. Strong acid versus weak base
D. Weak acid versus weak base

Question 13:

• JAMB 1997

The hydroxyl ion concentrated, (OH^-), in a solution of sodium hydroxide of pH 10.0 is?

A. 10^-10 mol dm^-3
B. 10^-6 mol dm^-3
C. 10^-4 mol dm^-3
D. 10^-2 mol dm^-3

Question 14:

• JAMB 1997

Which of the aqueous solutions with the pH values below will liberate hydrogen when it react with magnesium metals?

A. 13.0
B. 7.0
C. 6.5
D. 3.0

Question 15:

• JAMB 1998

The pH of a solution obtained by mixing 100cm³ of a 0.2M solution of NaOH is?

A. 1.3
B. 7.0
C. 9.7
D. 12.7