Acids and Bases - Hydrogen Ions and Ion Product Constant

Question 1

auto-ionization of water

Answer 1

• HOH(l) ->

Question 2

Kw equilibrium

Answer 2

• Kw = [H+][OH-] = 1*10^-14 M^2
• if H+ increases then OH- must decrease and the opposite is true
• if equal, solution is neutral

Question 3

given a [H+] of 1.50*10^-5 in a solution, calculate [OH-] and determine if the solution is acidic, basic, or neutral

Answer 3

• 1.5*10^-5 > 1810^-7 [H+] (acidic)
• Kw = [H+][OH-]
• 110^-14 M^2 = [1.5010^-5M][OH-] = 6.7*10^-10