J.R. S. answered 05/15/21
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Ph.D. in Biochemistry--University Professor--Chemistry Tutor
[H+] = 1x10-1.9 M because the definition of pH is the negative log of the [H+].
Converting this to a decimal, we have...
1x10-1.9 M = 1.26x10-2 M = 0.0126 M