Equilibrium reaction: HF(aq) + H2O ⇌ F-(aq) + H3O+
Step 1: Construct an ICE chart for the reaction.
Step 2: Write the Ka expression.
Ka of HF = 7.2x10-4
Step 3: Calculate the equilibrium concentrations.
Now, we will use the quadratic formula to solve for x. The quadratic formula is:
The calculation then splits into two ways:
Calculate the concentration of all species present and the pH of a 0.020-M HF solution.
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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.