Two containers containing 1 L each of two buffer solutions I and II having pH 4 and 5 respectively are separated by a semi-permeable membrane which allows only unionised HA to pass through it. If init

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Two containers containing 1 L each of two buffer solutions I and II having pH 4 and 5 respectively are separated by a semi-permeable membrane which allows only unionised HA to pass through it. If initially one mole of weak acid $HA (Ka = 1 0^{- 5})$ was added to any one of the container, ratio of total $[HA]_{1}$ (ionised and unionised) to total $[HA]_{II}$ (ionised as well as unionized) is

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[ HA ] I ​ [ A − ] I ​ ​ = 1 0 − 4 1 0 − 5 ​ = 0.1 and [ HA ] II ​ [ A − ] II ​ ​ = 1 0 − 5 1 0 − 5 ​ = 1 ∵ [ HA ] I ​ = [ HA ] II ​ [ HA ] I ​ + [ HA ] II ​ + [ A − ] I ​ + [ A − ] II ​ = 1 2 [ HA ] I ​ + 0.1 [ HA ] I ​ + [ HA ] I ​ = 1 [ HA ] I ​ = 31 10 ​ and [ HA ] II ​ = 31 10 ​ [ A − ] I ​ = 31 1 ​ and [ A − ] II ​ = 31 10 ​ Ratio = [ HA ] II ​ + [ A − ] II ​ [ HA ] I ​ + [ A − ] I ​ ​ = 20 11 ​

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