What is the [OH-] in a solution that has a [H3O+] = 2.0 x 10-2 M?

1 Answer
Dr. K.
Jun 22, 2018

#5.0# x #10^-13#

Explanation:

We'll use the ionic product of water formula,

#K_w# = #[H_3O^+]*[OH^-] = 1.0# x #10^-14#

rearrange the equation,
#[OH^-]#
#= 1.0# x #10^-14# / #[H_3O^+]#
#= 1.0# x #10^-14# / #2.0# x #10^-2#
#=5.0# x #10^-13#

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