pH Calculations Flipbook PDF

pH Calculations 1) Determine the pH of the following solutions: a) A 4.5 x 10-3 M HBr solution. b) A 3.67 x 10-5 M KOH s

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pH Calculations 1)

2)

Determine the pH of the following solutions: a)

A 4.5 x 10-3 M HBr solution.

b)

A 3.67 x 10-5 M KOH solution.

c)

A solution made by diluting 25 mL of 6.0 M HCl until the final volume of the solution is 1.75 L.

d)

5 L of an aqueous solution that contains 1.0 grams of HBr and 1.0 grams of nitric acid.

What are the pOHs for the solutions in problem 1? a)

___________________________

b)

___________________________

c)

___________________________

d)

___________________________

3)

Explain why even a basic solution contains some H+ ions.

4)

Explain why even an acidic solution contains some OH- ions.

pH Calculations – Answers 1)

Determine the pH of the following solutions: a)

A 4.5 x 10-3 M HBr solution. 2.4

b)

A 3.67 x 10-5 M KOH solution. 9.56

c)

A solution made by diluting 25 mL of 6.0 M HCl until the final volume of the solution is 1.75 L. 1.1 (the diluted solution is 0.086 M HCl)

d)

5 L of an aqueous solution that contains 1.0 grams of HBr and 1.0 grams of nitric acid. 2.2 (the solution has an overall acid concentration of 0.0056 M)

2)

What are the pOHs for the solutions in problem 1? a) b) c) d)

3)

11.6 4.44 12.9 11.8

Explain why even a basic solution contains some H+ ions. All aqueous solutions contain H+ ions from the autoionization of water, H2O
H+ + OH-.

4)

Explain why even an acidic solution contains some OH- ions. The same answer from #3 applies here.