why does PH increase more if base is added to a saturated solution than an unsaturated solution?

[mrh125]

i had a question like this in one test prep book and i dont understand why that is the case. could someone explain? thanks in advance.

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[brood910]

Saturated with what?
Pretty sure the question says what it is saturated with.

 

[mrh125]

Saturated with what?
Pretty sure the question says what it is saturated with.

I will dig it up. It was either a tbr or exam crackers problem on solubility.
Probably something of the form na2co3(s) <=> 2na+ (aq) + co32-(aq)

I was under more of the impression that is a general rule.

 

[Just call me john]

Usually a rise in pH means it becomes more basic. If the solution is saturated it is possible that the base could still uptake more H+ from the acid and create more water. The concentration of OH and H could then be offset I would think.

 

[shahcoco]

Usually a rise in pH means it becomes more basic. If the solution is saturated it is possible that the base could still uptake more H+ from the acid and create more water. The concentration of OH and H could then be offset I would think.

Yeah when I think of something saturated, I think of something that has the max number of hydrogens, so the base is going to react the furthest in the solution with more H's than the solution with less H's. This makes the saturated solution more basic because more of the base reacts.

 

[mrh125]

thank you!