Problem: The graphs represent the behavior of BaCO3 under different circumstances. In each case the vertical axis indicates the solubility of the BaCO3 and the horizontal axis represents the concentration of some other reagent.Which graph represents what happens to the solubility of BaCO3 as HNO3 is added?  

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We are asked which graph represents what happens to the solubility of BaCO3 as HNO3 is added.

The dissolution reaction of BaCOis as follows:

BaCO3 (s)  → Ba2+ (aq) + CO32- (aq)

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Problem Details

The graphs represent the behavior of BaCO3 under different circumstances. In each case the vertical axis indicates the solubility of the BaCO3 and the horizontal axis represents the concentration of some other reagent.

Which graph represents what happens to the solubility of BaCO3 as HNO3 is added?

 Three graphs, with concentration on the X-axis and solubility on the Y-axis (both axes unscaled). 1) Solubility decreases as concentration increases. 2) Solubility remains flat. 3) Solubility increases as concentration increases. 

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