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In this lesson, we will learn how to convert between hydronium and hydroxide ion concentrations in water and the corresponding values of pH and pOH.

Q1:

What is the pOH of a 0.0125 M solution of potassium hydroxide, K O H ?

Q2:

To 1 decimal place, what is the pH of 0 . 0 0 3 1 M C a ( O H ) 2 at 2 5 β C ? Assume that C a ( O H ) 2 ionizes completely.

Q3:

To 1 decimal place, what is the pH of 2 . 5 M K O H at 2 5 β C ? Assume that K O H ionizes completely.

Q4:

To 2 decimal places, what is the pH of 0 . 0 1 4 3 M N a O H at 2 5 β C ? Assume that N a O H ionizes completely.

Q5:

Calculate to 3 significant figures the hydroxide concentration of a solution with a pH of 6.52 at 2 5 β C . The self-ionization constant of water, πΎ w , is 1 . 0 0 Γ 1 0 β 1 4 at this temperature.

Q6:

To 2 decimal places, what is the pOH of 0 . 0 1 4 3 M N a O H at 2 5 β C ? Assume that N a O H ionizes completely.

Q7:

To 2 decimal places, what is the pOH of 0 . 2 1 M N a O H at 2 5 β C ? Assume that N a O H ionizes completely.

Q8:

To 1 decimal place, what is the pOH of a 0.000259 M aqueous H C l O 4 solution at 2 5 β C ? Assume that H C l O 4 is completely ionized.

Q9:

To 2 decimal places, what is the pH of 0 . 0 0 0 0 7 1 M B a ( O H ) 2 at 2 5 β C ? Assume that B a ( O H ) 2 ionises completely.

Q10:

What is the pOH of 0 . 0 0 3 1 M C a ( O H ) 2 at 2 5 β C ? Assume that C a ( O H ) 2 ionizes completely.

Q11:

What is the pH of a 0.0125 M solution of potassium hydroxide, K O H ?

Q12:

To 2 decimal places, what is the pOH of 2 . 5 M K O H at 2 5 β C ? Assume that K O H ionizes completely.

Q13:

To 1 decimal place, what is the pOH of 3 . 0 M H N O 3 at 2 5 β C ? Assume that H N O 3 ionizes completely.

Q14:

To 2 decimal places, what is the pOH of 0 . 0 0 0 0 7 1 M B a ( O H ) 2 at 2 5 β C ? Assume that B a ( O H ) 2 ionizes completely.

Q15:

The p O H of the conjugate base of an unknown aqueous acid is 4.17. What is the H + concentration of the unknown acid?

Q16:

Coffee has a pH of about 5.1. Calculate to 2 significant figures the hydroxide ion concentration of coffee at 2 5 β C .

Q17:

The hydronium ion concentration of vinegar is approximately 4 . 0 Γ 1 0 β 3 M. What is the corresponding value of the pOH?

Q18:

To 1 decimal place, what is the pH of 0 . 2 1 M N a O H at 2 5 β C ? Assume that N a O H ionizes completely.

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