AP Chemistry
8.11 pH and Solubility
A student prepares a saturated aqueous solution of calcium carbonate, \(\text{CaCO}_3\), in contact with excess solid \(\text{CaCO}_3\) in a beaker at \(25\ ^\circ\text{C}\), as represented by the equilibrium below:
\[ \text{CaCO}_3\text{(s)} \rightleftharpoons \text{Ca}^{2+}\text{(aq)} + \text{CO}_3^{2-}\text{(aq)} \]
The student adds a few drops of \(1.0\text{ M }\text{HNO}_3\text{(aq)}\) to the mixture at constant temperature. Which of the following best predicts and explains the effect of this addition on the amount of solid \(\text{CaCO}_3\) present in the beaker?
\[ \text{CaCO}_3\text{(s)} \rightleftharpoons \text{Ca}^{2+}\text{(aq)} + \text{CO}_3^{2-}\text{(aq)} \]
The student adds a few drops of \(1.0\text{ M }\text{HNO}_3\text{(aq)}\) to the mixture at constant temperature. Which of the following best predicts and explains the effect of this addition on the amount of solid \(\text{CaCO}_3\) present in the beaker?
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