1.

pH of a weakacid in 0.1 M solution is 4.3. Which statements are correct ?

Answer»

its 0.01 M Solution has `PH gt 4.3`
its 0.01 M solution has `pH lt 4.3 `
its 0.01 M solution degree of DISSOCIATION is LESS than in 0.1 M solution
its 0.01M solution degree of dissociation in less than in 0.1 M solution

Solution :` pH =[(1)/(2)[P^(ka)- log] C]`
` 4.3 =(1)/(2)[P^(ka) -log 10 ^(-1)] rArrP^(ka) =7.6`
` pH =(1)/(2)[7.6-log 10 ^(-2)]rArr pH=4.8`
As DIL `uparrow ,alpha " ALSO" uparrow `


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