14.3 pH and pOH

A solution at room tempearature with a pH of less than 7 will be:

acidic

If coffee has a [H3O+] of 10−5 M and an [OH−] of 10−9 M, it is:

acidic

Which of the following are acidic at room temperature?

all of the above

Which substance has a pH that is higher than pure water?

ammonia

As temperature increases, the pH of a sample of pure water will:

decrease

A solution at room tempearature with a pH of 7 will be:

neutral

The hydronium ion concentration of vinegar is approximately 4.0×10−3 M. What are the corresponding values of pOH and pH?

pH = 2.4, pOH = 11.6

The lowest value that is possible on the pH scale is:

there is no fundamental lower limit

What is the hydronium ion concentration in an aqueous solution with a hydroxide ion concentration of 0.001 M at 25∘C?

1.0*10-11

What is the hydronium ion concentration in a solution of pH 10.90?

1.3×10−11 M

A sample of carbon dioxide in water at room temperature has a hydronium ion concentration of 6.4×10−6 M. What is the hydroxide ion concentration of the solution?

1.6×10−9 M

At a particular temperature, a sample of pure water has a hydronium concentration of 5.4×10−8 M. Which of the following might be the temperature of the sample?

10∘C

A solution has a pOH of 7.1 at 10∘C. What is the pH of the solution given that Kw=2.93×10−15 at this temperature? Remember to report your answer with the correct number of significant figures.

12

Calculate the pOH of a solution that has [H3O+]=0.050 M at 25∘C.

12.70

What is the concentration of hydronium in a sample of pure water at room temperature?

1×10−14

What is the value of Kw for a sample of pure water at room temperature?

1×10−14

What is the hydroxide ion concentration of a solution at 25∘C with a pH of 7.40?

2.5×10−7 M

An aqueous solution at 25∘C has a hydroxide ion concentration of 3.6×10−8 M. What is the hydronium ion concentration of the solution?

2.8×10−7 M

At a particular temperature, a sample of pure water has a Kw of 7.7×10−14. What is the hydroxide concentration of this sample?

2.8×10−7 M

A solution of carbon dioxide in water has a hydroxide ion concentration of 3.5×10−6. What is the concentration of hydronium at 25∘C?

2.9×10−9 M

Water's pH and pOH are both 7 at:

25∘C

At a particular temperature, a sample of pure water has a Kw of 2.8×10−13. What is the hydronium ion concentration of this sample?

5.3×10−7 M

What is the pH of a solution with [H3O+]=1.50×10−6 M?

5.82

At a particular temperature, a sample of pure water has a Kw of 5.1×10−11. What is the hydronium concentration of this sample?

7.1×10−6 M

What is the pOH of a solution with [OH−]=3.44×10−8 M? Remember to report your answer with the correct number of significant figures.

7.46

What is the hydroxide ion concentration of a solution at 25∘C with a pH=9.90?

7.9×10−5

Which value for pOH corresponds to an acidic solution at room temperature?

9.2

Given that solution A has a pOH of 5.2 and solution B has a pOH of 8.6, which solution has a greater concentration of hydroxide ions?

Solution A

Given that solution A has a pOH of −0.4 and solution B has a pOH of 0.3, which solution has a greater concentration of hydroxide ions?

Solution A

Which of the following solutions has a greater concentration of hydronium ions? Solution A has a pH of 0.1. Solution B has a pH of 4.1.

Solution A

Which of the following solutions has a greater concentration of hydronium ions? Solution A has a pH of 8.0. Solution B has a pH of 13.5.

Solution A

Which of the following solutions has a greater concentration of hydroxide ions? Solution A has a pOH of 6.1. Solution B has a pOH of 12.5.

Solution A

Solution A has a pOH of 11.6, and solution B has a pOH of 8.8. Which solution has a greater concentration of hydroxide ions?

Solution B

An ammonia solution has a pH of 11.2, while a solution of formic acid has a pH of 2.8. Which solution has a greater concentration of hydronium ions?

The formic acid solution

A certain solution of methylamine has a pOH of 6.8, while a solution of pyridine has a pOH of 6.0. Which solution has a greater concentration of hydroxide ions?

The pyridine solution

An aluminum hydroxide solution has a pOH of 5.7, while a sodium cyanide solution has a pOH of 13.1. Which solution has the greater concentration of hydroxide?

The solution of aluminum hydroxide