write the competing equilibrium that will occur when a stron

write the competing equilibrium that will occur when a strong acid is added to the following equilibrium:

Ca2+(aq) + C2O4 2-(aq) equlibrium CaC2O4(s)

The competing equation, which will drive the top equilibrium to the left (and help to dissolve the precipitate) is 2H+ + (C2O4)2- <-----> H2C2O4.

Cl- is a spectator ion, and does nothing. So it can be left out.

Ca2+ ions do not react with HCl - only calcium metal does that.