SCH4U / Gen Chem 2 Exam: Unit 4b Acids & Bases Practice Test (pH, pOH, Titrations)

Unit 4 B - Practice Calculations Test - Acids & Bases
Category 1: Bronsted-Lowry Analysis & Conjugate Pairs

1. For the following reaction, identify all acids, bases, and conjugate acid-base pairs:
HBr(aq) + H2O(l) ⇌ H3O+(aq) + Br-(aq)
______ _____ _______ _____

2. For the following reaction, identify all acids, bases, and conjugate acid-base pairs:
NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH-(aq)
______ _____ _______ _____

3. For the following reaction, identify all acids, bases, and conjugate acid-base pairs:
HSO4- + CO3²- ⇌ SO4²- + HCO3-
_____ _____ ____ _____

4. Give the conjugate base of: HNO2, H2S, NH4+, H2PO4-, and CH3COOH.
​ ​ ​ _____ ___ ____ ______ _______

5. Give the conjugate acid of: PO4³-, CH3NH2, F-, HCO3-, and SO4²-.
​ ​ ​ ____ _______ __ _____ _____

Category 2: pH, pOH, and Ion Concentrations

1. Calculate the pH and pOH of solutions which have hydronium ion concentrations of:
a) 0.0050 M
b) 4.2 × 10⁻⁹ M

2. Calculate the pH and pOH of solutions which have hydroxide ion concentrations of:
a) 0.012 M
b) 1.5 × 10⁻⁴ M

3. Calculate the hydronium ion concentration [H3O+] of solutions with a pH of:
a) 2.15
b) 8.40

4. Calculate the hydronium ion concentration [H3O+] of solutions with a pOH of:
a) 12.10
b) 4.75

5. In a neutral solution at 25°C, calculate the [H+] and [OH-].

Category 3: Strong Acids and Strong Bases

1. Calculate [H3O+], [OH-], pH, and pOH for a 0.025 mol/L HCl solution at 25°C.