Calculate the hydronium ion ([H3O]+) concentration in an aqueous solution that contains 2.50 × 10-4 M in hydroxide ion. Enter your answer in exponential (E) format (sample 1.23E-4) with two decimal places and without units.
a. 2.50 × 1010 M
b. 4.0 × 10–11 M
c. 2.50 × 10-4 M
d. 4.0 × 10–10 M
e. 8.13 × 10–11 M
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