For an aqueous solution at 25 degrees C, what are the H3O+ and OH- concentration

Question

For an aqueous solution at 25 degrees C, what are the H3O+ and OH- concentration of a 0,02 M HCl solution, assuming that HCl is 100 percent dissociated (i.e., strong acid)? Answer in the order [H3O];[OH-]. A. 2.0 times 10 to the negative 2; 2.0 times 10 to the negative 2 B. 1.0 times 10 to the negative 7; 1.0 times 10 to the negative 7 C. 2.0 times 10 to the negative 2; 5.0 times 10 to the negative 13 D. 5.0 times 10 to the negative 13; 2.0 times 10 to the negative 2 E. 1.4 times 10 to the negative 1; 7.1 times 10 to the negative 14

Explanation / Answer

H3O+ = 0.02 = 2 x10^ -2 , OH- = 10^ -14/2 x10^ -2 = 5 x 10^ -13 answer is option C

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