AQA A Level chemistry

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anon25x
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Can the ka equation only be used for weak acids and strong bases ? Also when is the kw equation-ionic product of water- used please?
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ElegantLampshade
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See attached notes. Hope it helps.

If you're still unsure, watch this video about Kw... https://www.youtube.com/watch?v=_tCfeqnWdoM

Good luck!
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ElegantLampshade
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charco
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(Original post by anon25x)
Can the ka equation only be used for weak acids and strong bases ? Also when is the kw equation-ionic product of water- used please?
Ka, the acid dissociation constant, is a type of equilibrium constant.

In strong acids there is complete dissociation, so an equilibrium is effectively not established.

Ka should only be used for weak acids when the molecular acid, HA is in equilibrium with its conjugate base, A-.

HA(aq) <==> H+(aq) + A-(aq)
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