In which of the following solution would CaC2O4 have the highest molar solubility? Please help.
A) 0.01 M NaCl
B) 0.01 M H2C2O4
C) 0.01 M Na2C2O4
D) 0.01 M NaHC2O4
E) 0.01 M HCl
I think it is E because it is a strong acid and will completely dissociate..
To determine which solution would have the highest molar solubility of CaC2O4, we need to consider the common ion effect. The common ion effect states that the solubility of a salt is reduced in the presence of a common ion.
CaC2O4 dissociates into Ca2+ and C2O4 2- ions in solution. So, we need to look for the solution that contains an ion that is common to those in CaC2O4.
Let's consider each option and identify if there is a common ion:
A) 0.01 M NaCl: No common ion.
B) 0.01 M H2C2O4: No common ion.
C) 0.01 M Na2C2O4: Contains the C2O4 2- ion, which is common to CaC2O4.
D) 0.01 M NaHC2O4: No common ion.
E) 0.01 M HCl: No common ion.
Based on the common ion effect, the solution with the highest molar solubility of CaC2O4 would be the one that does not contain a common ion.
Therefore, the answer is option B) 0.01 M H2C2O4.