Write the mass-balance expressions for a solution that is
(a) 0.2 M in HF.
(b) 0.10 M in H3PO4.
(c) 0.0500 M in HClO2 and 0.100 M in NaClO2.
(d) 0.100 M in NaOH and saturated with
Zn(OH)2, which undergoes the reaction
Zn(OH)2 + 2OH- ⇆ Zn(OH)42-.
(e) Saturated with PbCl2.