Buffer calc help

Hello i am stuck on this question. part iii.
https://share.icloud.com/photos/05ppQ-sKiN13LSs4C2oSiEmMA
https://share.icloud.com/photos/06h1ipLT1xjT2pLwLUKR2Ks6g

i’ve attached mark scheme too. i don’t get why salt over acid equals ka over H.
thanks.

It is a simple rearrangement of Ka = [H+][A-] / [HA]

It is a simple rearrangement of Ka = [H+][A-] / [HA]

ahhh i get it thank you

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