Acids and equilibrium Chapter 14. Acid dissociation equation prediction Where A is an acid H A + H 2 O  H 3 O + + A - It is also written H A  H + +

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Presentation transcript:

Acids and equilibrium Chapter 14

Acid dissociation equation prediction Where A is an acid H A + H 2 O  H 3 O + + A - It is also written H A  H + + A - 2

Calculating the pH of strong acids HCl is a strong acid. Therefore, it dissociates nearly 100% as follows HCl + H 2 O  H 3 O + + Cl - We can conclude that the solution contains only H 3 O + and Cl - ions, and no HCl molecules. H 3 O +, Cl -, and H 2 O are the MAJOR SPECIES, those solution components present in relatively high amounts. The concentration of the acid is equal to the hydronium concentration for strong acids.

Calculating pH of Strong Acids Calculate the pH, pOH, [H 3 O + ], and [OH - ] of 0.10 M HNO 3 Calculate the pH, pOH, [H 3 O + ], and [OH - ] of 1.0 x M HCl

Calculating the pH of a weak acid These require ICE tables Again you could use simplified assumptions and test the 5% rule. Solver functions on the calculator are completely legal to use on my test and the AP test.

Problem The hypochlorite ion (ClO - ) is a strong oxidizing agent found in household bleaches and disinfectants. It is also the active ingredient that forms when swimming pool water is treated with chlorine. In addition to its oxidizing abilities, the hypochlorite ion has a relatively high affinity for protons (it is a much stronger base than Cl -, for example) and forms the weakly acidic hypochlorous acid (HOCl, K a = 3.5 x ). Calculate the pH of a M aqueous solution of hypochlorous acid.

Answer HOCl + H 2 O ⇌ H 3 O + + ClO - I.10 M 0 0 C -x +x +x E.1-x x x K a = [H 3 O + ] [ClO - ] 3.5x10 -8 = x 2 [HOCl].1-x x = 5.9 x10 -5 The x value is [H 3 O + ] so pH = 4.23

Another problem The conjugate acid of ammonia, NH 4 +, is a weak acid. If a 0.2 M NH 4 Cl solution has a pH of 5.0, what is the K a of NH 4 + ?

Another problem Cyanic acid (HOCN), an extremely acrid, unstable substance, is used industrially to make cyanates. What is the [H 3 O + ] and pH of 0.10 M HOCN? K a of cyanic acid is 3.5 x10 -4.

Mixing weak acids Calculate the pH of a solution that contains 1.00 M HCN (K a = 6.2 x ) and 5.00 M HNO 2 (K a = 4.0 x ). Also calculate the concentration of cyanide ion (CN - ) in this solution at equilibrium.