To determine Q for a dissolution reaction, which statement is correct?

To determine Q for a dissolution reaction, which statement is correct?

• A. Use the initial concentrations of the ions in the expression.
• B. Q is always equal to Ksp regardless of concentrations.
• C. Use the reaction quotient expression with the actual concentrations at that moment.
• D. Q is the sum of the ion concentrations.

Answer: (C)