Which of the following is true about the pH of a solution of sulfuric acid? If t
ID: 933593 • Letter: W
Question
Which of the following is true about the pH of a solution of sulfuric acid?
If the solution is dilute the pH can not be calculated.
If the solution is dilute the pH is completely controlled by the first dissociation.
If the solution is dilute the pH is completely controlled by the second dissociation.
If the solution is concentrated the pH is partially controlled by the second dissociation.
If the solution is dilute the pH is partially controlled by the second dissociation.
If the solution is dilute the pH can not be calculated.
If the solution is dilute the pH is completely controlled by the first dissociation.
If the solution is dilute the pH is completely controlled by the second dissociation.
If the solution is concentrated the pH is partially controlled by the second dissociation.
If the solution is dilute the pH is partially controlled by the second dissociation.
Explanation / Answer
Which of the following is true about the pH of a solution of sulfuric acid?
Dissociation of H2SO4 :
H2SO4 is diprotic acid. In dilute solution It will dissociates as follow :
H2SO4 (aq) + H2O (l) ------> H3O + (aq) + HSO4 -(aq)
Again HSO4- (aq) will dissociates as
HSO4-(aq) + H2O (l) ------> H3O+ (aq) + SO4 2- (aq)
Both the steps are reponsible for formation of H3O+ and pH depends upon concentration of H3O+
pH =- log [H3O+]
In first step formation if H3O+ is large as compare second step so in dilute solution of H2SO4 , second steps partially controls the pH of the solution.
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