Calculate the hydroxide ion...?

Chemistry question... any work shown is very appreciated... Thanks!

Calculate the hydroxide ion (OH-) concentration in a 0.028 molar solution of nitric acid (HNO3).

Answer:
HNO3 --> H+ + NO3 - (100% dissociation)

so
[HNO3] = [H+] = 0.028 M

we know the K for water is
Kw = 10^-14
[H+] [OH-] = 10^-14
so
0.028 * [OH-] = 10^-14
we can conclude that hydroxid ion concentration will be:

► [OH-] = 3.57 x 10^-13

I hope this helps
  • Calculate the number of moles of:?
  • Do the solubilities of all ionic solids increase as the temperature increases? why?
  • Is CN more electronegative than Cl?
  • Read below?
  • What is the pH of 0mL base?
  • Please show me details of how to solve the following question:?
  • Urgent chem help needed!! first correct answer gets 10 points!?
  • Give the equation for the incomplete combustin of methane to form carbon monoxide and water vapor.?