How does an increase in temperature affect the ion product constant (K_w) and the equilibrium of auto-ionization?

• A. K_w decreases, shifting the equilibrium towards less ion formation.
• B. K_w fluctuates randomly, with unpredictable effects on equilibrium.
• C. K_w increases, shifting the equilibrium towards more ion formation.
• D. K_w remains constant, with no effect on equilibrium.

Answer: (C)