CHEM 1311 S26: Chapter 9

Net Ionic Equations

100

Find net ionic equation:

NaCl + AgNO₃ --> ??

Ag⁺(aq) + Cl^-(aq) --> AgCl(s)

200

Find net ionic equation

HCl + NaOH --> ??

H⁺(aq) + OH^-(aq) --> H₂O(l)

300

Find net ionic equation

BaCl₂ + Na₂SO₄ --> ??

Ba²⁺(aq) + SO₄^2-(aq) --> BaSO₄(s)

400

Find net ionic equation

CH₃COOH(aq) + NaOH --> ??

CH₃COOH(aq) + OH^-(aq) --> CH₃COO^-(aq) + H₂O(l)

500

Find net ionic equation

NH₃ + HCl --> ??

NH₃(aq) + H⁺(aq) --> NH₄⁺(aq)

pH Calculations

100

A solution has [H₃O⁺] = 1.0 x 10^-3 M

Find the pH

3.00

200

A solution has pH of 5.00

Find the concentration of the solution

1.0 x 10^-5 M

300

A solution has [H₃O⁺] = 3.2 x 10^-4 M

Find the pH

3.49

400

A solution has [H₃O⁺] = 2.5 M

Find the pH

-0.40

500

A solution has pH of 2.37

Find the concentration of the solution

4.3 x 10^-3 M

Molar Concentrations

100

You dissolve 0.50 moles of NaCl in 2.00 L of solution. What is the molarity?

0.25 M

200

You have 0.75 L of a 1.20 M HCl solution. How many moles of HCl are present?

0.90 mol

300

You dissolve 5.85 g of NaCl in enough water to make 500. mL of solution. What is the molarity?

0.200 M

400

How many liters of a 0.250 M NaOH solution are needed to contain 0.125 moles of NaOH?

0.500 L

500

You mix 100.0 mL of 0.200 M HCl with 50.0 mL of 0.300 M HCl. What is the final molarity of HCl?

0.233 M

Random Word Problems

100

A student dissolves 2.00 moles of KNO₃ in enough water to make 1.00 L of solution.

What is the molarity of the solution?

2.00 M

200

A solution has a hydronium ion concentration of 4.5 x 10^-6 M

What is the pH?

5.35

300

What mass of AgCl forms when 20.0 mL of 0.010 M AgNO₃ reacts with excess NaCl?

0.0287 g

400

A student mixes 75.0 mL of 0.150 M NaCl with 25.0 mL of 0.300 M NaCl.

What is the final concentration of NaCl?

0.188 M

500

A student mixes 50.0 mL of 0.0200 M AgNO₃ with 30.0 mL of 0.0300 M NaCl.

What is the mass of AgCl formed?

0.129 g AgCl

Oxidation Numbers

100

What is the oxidation number of sulfur in H₂S?

-2

200

What is the oxidation number of nitrogen in NO₃^- ?

+5

300

Find the oxidation number of manganese in KMnO₄

+7

400

What is the oxidation number of hydrogen in CaH₂?

-1

500

What is the oxidation number of chlorine in ClO₄^-?

+7