Calculate the pH, pOH, [H + ], and [OH - ] for a M solution of HNO 3 [H + ] = M pH = - log [0.004] = 2.40 pOH = = [OH - ] = inverse log (-11.60) = X M

Calculate the pH, pOH, [H +], and [OH - ] for a 1.0 M solution of hydrofluoric acid if the K a for hydrofluoric acid is 7.2 x HF  [ H + ] + [F - ] K a = [ H + ] [ F - ] [HF] HF  [ H + ] + [F - ] Initial (M) Change (M) - x x x Equil (M) x x x 7.2 x = [ x] [x] x = 2.7 x M = [H + ] [ 1.0] pH = - log 2.7 x = 1.57 pOH = 14 – 1.57 = [OH - ] = inverse log (-12.43) = 3.7 x M

Calculate the K a of formic acid (HCHO 2 ) if a 0.10 M solution has a pH of 2.38 at 25  C. HCHO 2  [ H + ] + [CHO 2 - ] K a = [ H + ] [[CHO 2 - ] [HCHO 2 ] [H + ] = inverse log (-2.38) = M HCHO 2  [ H + ] + [CHO 2 - ] Initial (M) Change (M) Equil (M) 0.10 – K a = ( ) ( ) = 1.8 x