1)
- .010 M HCl: [H⁺] = 0.010 M, [OH⁻] = 1.0 × 10⁻¹² M, pH = 2.00, pOH = 12.00
- .0010 M NaOH: [H⁺] = 1.0 × 10⁻¹¹ M, [OH⁻] = 0.0010 M, pH = 11.00, pOH = 3.00
- .25 M benzoic acid (Ka ≈ 6.3 × 10⁻⁵): [H⁺] ≈ 3.97 × 10⁻³ M, [OH⁻] ≈ 2.52 × 10⁻¹² M, pH ≈ 2.40, pOH ≈ 11.60
- .50 M methylamine (Kb ≈ 4.4 × 10⁻⁴): [OH⁻] ≈ 1.48 × 10⁻² M, [H⁺] ≈ 6.76 × 10⁻¹³ M, pH ≈ 11.83, pOH ≈ 2.17
- .12 M propionic acid (Ka ≈ 1.3 × 10⁻⁵): [H⁺] ≈ 1.25 × 10⁻³ M, [OH⁻] ≈ 8.00 × 10⁻¹² M, pH ≈ 2.90, pOH ≈ 11.10
- .085 M ammonia (Kb ≈ 1.8 × 10⁻⁵): [OH⁻] ≈ 1.24 × 10⁻³ M, [H⁺] ≈ 8.06 × 10⁻¹² M, pH ≈ 11.09, pOH ≈ 2.91
2) Ka = 5.3 × 10⁻⁴
3) Kb = 1.3 × 10⁻⁴
4) Ka = 6.3 × 10⁻⁵
5) Ka = 2.0 × 10⁻⁸
Parent Tip: Review the logic above to help your child master the concept of identifying acid and base worksheet.
