We’re being asked to determine the H3O+ concentration if [OH–] = 3.9 × 10–3 M. We’re given Kw = 2.5 × 10–14 at 37.0 ˚C.
Recall that Kw is the auto-ionization product of water. For the following reaction:
2 H2O(l) ⇌ H3O+(aq) + OH–(aq)
the auto-ionization product constant is given by:
Note that each concentration is raised by the stoichiometric coefficient: [H3O+] and [OH–] are raised to 1.
At body temperature of 37.0°C, K w = 2.5 x 10-14. Calculate the [H3O+] if the [OH -] = 3.9 x 10-3 M.
A. 2.5 x 10-12 M
B. 6.4 x 10-12 M
C. 3.9 x 10-3 M
D. 1.0 x 10-7 M
E. 2.5 x 10-14 M
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