Which salt has the highest molar solubility in pure water?
Cd(OH)2, Fe(OH)2, PbCrO4, CdCO3,
Mn(OH)2
Look up Ksp for each salt, then calculate solubility. Finally, compare the results.
To determine which salt has the highest molar solubility in pure water, we need to compare the solubility product constants (Ksp) of the salts. The salt with the highest Ksp value will have the highest molar solubility in water.
Let's calculate the Ksp values for each salt:
1. Cd(OH)2:
The balanced equation for the dissolution of Cd(OH)2 in water is:
Cd(OH)2(s) ⇌ Cd2+(aq) + 2OH-(aq)
The Ksp expression is:
Ksp = [Cd2+][OH-]^2
2. Fe(OH)2:
The balanced equation for the dissolution of Fe(OH)2 in water is:
Fe(OH)2(s) ⇌ Fe2+(aq) + 2OH-(aq)
The Ksp expression is:
Ksp = [Fe2+][OH-]^2
3. PbCrO4:
The balanced equation for the dissolution of PbCrO4 in water is:
PbCrO4(s) ⇌ Pb2+(aq) + CrO4^2-(aq)
The Ksp expression is:
Ksp = [Pb2+][CrO4^2-]
4. CdCO3:
The balanced equation for the dissolution of CdCO3 in water is:
CdCO3(s) ⇌ Cd2+(aq) + CO3^2-(aq)
The Ksp expression is:
Ksp = [Cd2+][CO3^2-]
5. Mn(OH)2:
The balanced equation for the dissolution of Mn(OH)2 in water is:
Mn(OH)2(s) ⇌ Mn2+(aq) + 2OH-(aq)
The Ksp expression is:
Ksp = [Mn2+][OH-]^2
Now that we have the Ksp expressions for each salt, we can look for their corresponding Ksp values in a reliable source such as a textbook or chemical database.
After comparing the Ksp values, you will find that the salt with the highest Ksp value is the one with the highest molar solubility in pure water.