At 50°C the Autoionization Constant for Pure Water, K_w, Is $5.48 \times 10 ^ { - 14 }$

At 50°C the autoionization constant for pure water, K_w, is $5.48 \times 10 ^ { - 14 }$ . What is the H₃O⁺ concentration in pure water at 50°C?

A) $5.48 \times 10 ^ { - 14 }$ M
B) 1.01 × 10^-7 M
C) $1.17 \times 10 ^ { - 7 }$ M
D) $2.34 \times 10 ^ { - 7 }$ M
E) 1.01 × 10^-14 M