I would really love an explanation on how to get the answer. Thanks is advance!
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Find the pH first.
pH = -log[H3O+]
pH = -log[2.0 * 10^-4] = 3.70
Then, using this relation pH + pOH = 14, find the pOH
3.70 + pOH = 14
pOH = 10.3
Then find the OH concentration by working backwards using this pOH = -log[OH]
10.3 = -log[OH]
[OH] = 5.01 * 10^-11 M
pH = -log[H3O+]
pH = -log[2.0 * 10^-4] = 3.70
Then, using this relation pH + pOH = 14, find the pOH
3.70 + pOH = 14
pOH = 10.3
Then find the OH concentration by working backwards using this pOH = -log[OH]
10.3 = -log[OH]
[OH] = 5.01 * 10^-11 M