6A.19

[Marjan MJ Stuckart 3A]

Can someone advise me on how to begin solving problem 6A.19 from the textbook? The problem is asking me to calculate the molar concentration of OH- in solutions with the following molar concentrations of H3O+: 0.020 mol * L^-1, 1.0 * 10^-5 mol * L^-1, and 3.1 mol * L^-1. Any help is appreciated, thank you!

[Jake Matsumoto 3E]

For this question, we can use the property that the [H30+]*[OH-] = Kw, which is 1.0x10^-14. Since we are given concentrations for H30+, all we need to do is solve for OH-. For example, part a would be [OH-]=Kw/[H30+]. Hope this helps!