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April 19, 2014

Homework Help: Chemistry

Posted by Amy on Monday, November 12, 2012 at 9:30pm.

1.) Hydrogen fluoride (HF) is a weak acid, which when dissolved in water reacts slightly by the equation: HF(g) + H2O(l) = H3O^+(aq) + F^-(aq).
Predict the direction of shift of the equilibrium that occurs if some NaOH is added to the solution. Explain

-My guess is that equilibrium shifts to the LEFT because the concentration of reactants increases?

2.) Calcium fluoride (CaF2) is a sparingly soluble solid: CaF2(s) = Ca^+2 (aq) + 2F^-(aq). Predict whether CaF2 is more soluble in pure water of in water containing some HNO3. Explain in terms of shifts of equilibria.
(Hint: pay attention to your answer in question 1)

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