The graph below shows the solubility of a salt as a function
of pH. Which of the following choices explain the shape
of this graph? (a) None; this behavior is not possible.
(b) A soluble salt reacts with acid to form a precipitate,
and additional acid reacts with this product to dissolve it.
(c) A soluble salt forms an insoluble hydroxide, then additional
base reacts with this product to dissolve it. (d) The
solubility of the salt increases with pH, then decreases because
of the heat generated from the neutralization reactions.
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