Kw acid and base chemistry question simpleWatch
for like Ca(OH)2 of 0.02 Mol dm we do -log(0.02 X 2) so why not for NH3?
when ammonia dissolves in water it forms ammonium hydroxide, only 1 hydroxide ion is formed. You will need the conc of this in your calculation. Remember for pH calculations its the conc of H+ in SOLUTION- pH is a property of water as you mentioned, from the Kw constant which refers to water. T
and when Ca(OH)2 dissolves in water = Ca+ + 2OH