2.00g of NaOH are dissolved in water to make 2.00L of solution. What is the concentration of hydronium ions, [H3O+], in this solution?

Answer 1

NaOH is a strong base, so it will completely dissociate into OH-.

pOH+pH=14, so 14-pOH=pH

Solve for pOH

2.00g of NaOH*(1 mole of NaOH/39.997 g)= moles of NaOH

moles of NaOH/2.00L=molarity of NaOH

-log[molarity of NaOH]=pOH

14-pOH=pH

Answer 2

Forgot a step:

pH=-log[H3O+], so

10^-pH=H3O+