16.6 Acidity and Basicity of Salts

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    NEGLIGIBLE CATIONS NEGLIGIBLE ANIONS
    Group 1 metal ions (Li+, Na+, K+, Rb+, Cs+)

    Group 2 metal ions (Mg2+, Ca2+, Sr2+, Ba2+)

    Transition metals with +1 charge (such as Ag+)
    Conjugate bases of strong acids

    (Cl-, Br-, I-, NO3-, ClO4-, ClO3-)


    ALL OTHER CATIONS ARE ACIDIC ALMOST ALL OTHER ANIONS ARE BASIC
    HSO4- is Acidic
    CATION ACIDITY TRENDS
    More + charged ➔ more acidic (Fe3+ > Fe2+)
    Smaller cations ➔ more acidic (Fe2+ > Ru2+)

    Identify the following as Acidic, Basic, or Neutral

    NaCl

    BaF2

    Al(ClO4)3

    Mg(OH)2

    NH4CN

    pH Calculations with Salts
    What is the pH of 0.1M NaF? (Ka, HF = 6.8×10-4)

     

    What is the pH of 0.1M NH4Cl? (Kb, NH3 = 1.75×10-5)