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pH Answers

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The pH of a solution decreases by 2.0. How does the hydronium ion concentration of the solution change?

increases to 2 times the original concentration

increases to 100 times the original concentration

decreases to of the original concentration

decreases to of the original concentration

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How can the pH of a solution be calculated if the pOH is known?

by taking the negative logarithm of pOH

by adding the pOH to 14

by raising 10 to the power of –pOH

by subtracting the pOH from 14

The pH of a solution is 2.0. Which statement is correct?Useful formulas include , , , and .

The pOH of the solution is 12.0.

The concentration of OH– ions is 1.0 10–2 M.

The concentration of ions is 100.0 M.

The pOH of the solution is 16.0.

A solution containing HCl would likely have

a high pH and a low pOH.

a low pH and a high pOH.

a high pH and a high pOH.

a low pH and a low pOH.

The pOH of a solution is 10.75. What is the concentration of OH– ions in the solution?Use .

3.162 10–108 M

1.778 10–11 M

1.075 102 M

5.623 1010 M

Which statement about the self-ionization of water is correct?

Two water molecules interact to form a water molecule and a hydroxide ion.

Two water molecules interact to form a hydronium ion and a hydroxide ion.

Two water molecules interact to form two hydronium ions.

Two water molecules interact to form two hydroxide ions.

Which statement best describes the pH of pure water?

It is neutral because the concentration of hydronium ions equals that of hydroxide ions.

It is neutral because the pure liquid contains neither hydronium ions nor hydroxide ions.

It is acidic because it has a hydronium ion concentration of .

It is basic because it has a hydroxide ion concentration of .

Based on the definition of logarithms, what is the difference in hydrogen ion concentration between a substance with a pH of 2 and a substance with a pH of 3?

A substance with a pH of 2 has a 10 times higher concentration of H+ than a substance with a pH of 3.

A substance with a pH of 3 has a 10 times higher concentration of H+ than a substance with a pH of 2.

A substance with a pH of 2 has a 100 times higher concentration of H+ ions than a substance with a pH of 3.

A substance with a pH of 3 has a 100 times higher concentration of H+ ions than a substance with a pH of 2.

What is the equilibrium constant of pure water at 25°C?

1014

10–14

10–7

107

Which of these correctly defines the pH of a solution?

the negative log of the hydronium ion concentration

the log of the hydronium ion concentration

the negative log of the hydroxide ion concentration

the log of the hydroxide ion concentration

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