Kw acid and base chemistry question simple

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interlanken-fall
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for NH3 of 1 Mol dm, why don't we multiply the 1 by 3 when finding the pH ? as its H3
for like Ca(OH)2 of 0.02 Mol dm we do -log(0.02 X 2) so why not for NH3?
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scimus63
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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
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interlanken-fall
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(Original post by scimus63)
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
ohhhhhhh
and when Ca(OH)2 dissolves in water = Ca+ + 2OH
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scimus63
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yep
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