To find the pOH of a solution with a given concentration of hydronium ions ([H3O+]), we can use the following formula:
pOH = -log[H3O+]
Given that the concentration of hydronium ions is 0.00020 M, we can plug this value into the formula:
pOH = -log(0.00020)
pOH ≈ -log(2.0 x 10^-4)
pOH ≈ -(-3.70)
pOH ≈ 3.70
Therefore, the pOH of a solution with a hydronium ion concentration of 0.00020 M is approximately 3.70.
pOH of H3O+] = 0.00020
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