Calculating the pH of Strong Monobasic Acids

    Cards (9)

    • What is a characteristic of a monobasic acid?
      A monobasic acid donates ONE H⁺ ion per molecule of acid.
    • What does it mean for a strong acid to dissociate completely?
      It means that the acid breaks down entirely into its ions in solution.
    • Give two examples of strong monobasic acids.
      HCl (hydrochloric acid) and HNO₃ (nitric acid).
    • How do you calculate the pH of strong monobasic acids?
      • Use the formula: pH=\text{pH} =log[H+] -\log[H^+]
      • [H⁺] is the concentration of the acid in moldm⁻³.
    • What happens to the pH as the concentration of a strong monobasic acid increases?
      The higher the concentration, the lower the pH.
    • What is the formula to calculate pH from hydrogen ion concentration?
      pH = -log[H⁺]
    • What is the pH of a 0.500 moldm⁻³ HCl solution?
      The pH is 0.3.
    • Calculate the pH of the following strong monobasic acid solutions (to 1 d.p.):
      1. 0.600 moldm⁻³ HCl
      2. 0.800 moldm⁻³ HNO₃
      3. 0.440 moldm⁻³ HClO₄
      4. pH = -log(0.600) ≈ 0.2
      5. pH = -log(0.800) ≈ 0.1
      6. pH = -log(0.440) ≈ 0.4
    • What is the significance of the button on your calculator mentioned in the study material?
      It is used to find the logarithm of the hydrogen ion concentration.