Question

A 1.0 M H2S solution has a pH = 3.75 at equilibrium. What is the value of Ka?

Answer 1

Find the concentration of the hydronium ion first. Can you do that?

Answer 2

no I'm sorry idk how to do that. I forgot how

Answer 3

@ghuczek could you explain how?

Answer 4

\[\color{green}{[\mbox{H}_3\mbox{O}^+] = 10^{-pH}}\]

Answer 5

Then, write the equation and the equilibrium expression.

Answer 6

so it would be \[[H _{3}O+]=10^{-3.75} \] ?

Answer 7

how would I then solve that

Answer 8

Use a calculator. Raise ten to that exponent.