What is the ph of an aqueous solution at 25.0 °c that contains 3.98 ⋅ 10-9 m hydronium ion? what is the ph of an aqueous solution at 25.0 °c that contains 3.98 10-9 m hydronium ion? 5.600 9.000 8.400 7.000 3.980?

The equation below shows the reaction of zinc with hydrochloric acid (hcl). zn (s) + 2 hcl (aq) —> zncl2 (aq) + h2 (g) what will happen if the concentration of hcl is decreased? a. more zncl2 will be produced. b. the reaction rate will slow down. c. the hydrochloric acid will become more acidic. d. the reaction will produce water instead of hydrogen gas.