Hey there! Sign in to join this conversationNew here? Join for free

why does altering the ratio of weak acid : it's salt alter pH of the buffer solution? watch

    • Thread Starter

    So a weak acid and it's salt is used to make a buffer. If the ratio of them is changed the pH changes. My reasoning is that the amount of acid dissociation would be altered now. Am I right?

    In a buffer the ratio is determined by Ka. Adding/removing H+ makes the ratio of [H+][A-]/[HA] no longer equal to Ka, so the equilibrium shifts until the ratio once again equals Ka.

    Which is a fancy way of saying, you are correct.
Do you agree with the PM's proposal to cut tuition fees for some courses?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.