# pH and Titrations (Worksheet)

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Work in groups on these problems. You should try to answer the questions without referring to your textbook. If you get stuck, try asking another group for help.

## Q1.

What is the pH of 0.0111M $$H_3O^+$$? Is the solution neutral, acidic, or basic?

## Q2.

What is the pH of $$1.23 \times 10^{‐3}\; M \;HCl$$? Is the solution neutral, acidic, or basic?

## Q3.

What is the pH of 0.0333 M $$H_3O^+$$? Is the solution neutral, acidic, or basic?

## Q4.

What is the pH of 0.0347 M $$H_3O^+$$? Is the solution neutral, acidic, or basic?

## Q5.

What is the pH of $$5.04 \times 10^{‐3} \; M \;H_3O^+$$? Is the solution neutral, acidic, or basic?

## Q6.

What is [$$H_3O^+$$] of a solution with a pH of 9.78?

## Q7.

What is [$$H_3O^+$$] of a solution with pH of 4.33?

## Q8.

What is [$$H_3O^+$$] of a solution with pH of 2.77?

## Q9.

What is [$$H_3O^+$$] of a solution with pH of 5.18?

## Q10.

If 25.8mL of $$AgNO_3$$ is needed to precipitate all the $$Cl^‐$$ ions in a 785 mg sample of $$KCl$$ (precipitating $$AgCl$$), what is the molarity of the $$AgNO_3$$ solution?

## Q11.

If 45.3 mL of 0.108 M HCl solution is needed to neutralize a solution of $$KOH$$, how many grams of $$KOH$$ must be present in the solution?

## Q12.

How many millitliters of 0.120 M HCl are needed to completely neutralize 50.0mL of 0.101 M $$Ba(OH)_2$$ solution?

## Q 13.

If 55.8 mL of $$BaCl_2$$ solution is needed to precipitate all the sulfate ion in a 752 mg sample of $$Na_2SO_4$$, what is the molarity of the solution?

## Q14.

If 42.7 mL of 0.208 M HCl solution is needed to neutralize a solution of $$Ca(OH)_2$$, how many grams of $$Ca(OH)_2$$ must be in the solution?