A 020 M Solution of the Weak Acid HA Is Found

Multiple Choice

A 0.20 M solution of the weak acid HA is found to have a pH of 3.25. What is the K _a for this acid?

A) 10 ^{- 3.25}
B) 3.2×10 ^{- 6}
C) 0.12
D) 1.6×10 ^{- 6}
E) 3.2×10 ^{- 7}