Two Buffers A and B having pH = 4 and pH = 6 respectively are prepared from an acid HX and its salt NaX . Both the Buffers are 0.5 M in HX . If the pH of the solution obtained by mixing equal volumes

Question

Two Buffers A and B having pH = 4 and pH = 6 respectively are prepared from an acid HX and its salt NaX . Both the Buffers are 0.5 M in HX . If the pH of the solution obtained by mixing equal volumes of two Buffers is "Y" then the value of 1000 Y is . [ K a ( HX ) ​ = 1 0 − 5 , lo g 5.05 = 0.7 ]

TestHub · Accepted Answer

Buffer − A pH = pK a ​ + lo g A S ​ 4 = 5 + lo g A S ​ A S ​ = 10 1 ​ [ S a lt ] = 0.05 ​ Similarly, for Buffer -B [Salt] = 5 M Now when the solutions are mixed [ S a lt ] = 2 V 0.05 V + 5 V ​ = 2 5.05 ​ [ A c i d ] = 2 V 0.5 V + 0.5 V ​ = 0.5 p H = p K a ​ + lo g A S ​ = 5.7

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