Gen Chem TBR solubility

[syk92]

Please see the image attached.

I understand why A and B can't be the answer. But I'm having a hard time convincing why D can't be the answer. Why are they in a linear relationship?

Any help would be greatly appreciated.

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[aldol16]

Was it a stand-alone question?

 

[deleted783484]

Because ph= -log H+ so you are comparing logs that's how I would eliminate B and D. And since we know that when the pH decreases there would be more dissociation of calcium hydroxide and when the ph increases the opposite happens to maintain a constant ph (buffer) then the answer is C