pH

ionic product of water known as Kw

  • At 298K:

    • Kw= [H^+][OH^-]=1.00×10^-14 mol²dm^-6

    • [H^+]² = 1.00×10^-14

    • [H^+] = 1.00×10^-7

  • pH = - log(b10)[H^+]

    • given to 2dp

Strong acids

  • HA(aq) —> H^+ + A^- (aq)

  • strong acids fully dissociate

    • thus [H^+] = [HA]

  • [H^+] = 10^-pH

  • conc of acid is thus [H^+]/# of H+ ions