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Sia

15240672380's Question
Chemistry
Posted 10 months ago

The pH\mathrm{pH} of a 0.72M0.72 \mathrm{M} solution of HF\mathrm{HF} is....
3.60
1.81
12.19
0.14
.02
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Answer from Sia
Posted 10 months ago
B
Key Concept
Weak Acid Ionization and pH Calculation
Explanation
Hydrofluoric acid (HF) is a weak acid that partially dissociates in water. To find the pH of a weak acid solution, we use the acid dissociation constant (Ka) and the initial concentration to solve for the concentration of hydrogen ions ([H+][H^+]). The pH is then calculated using the formula pH=log[H+]pH = -\log[H^+]. Given that the Ka of HF is 6.8×1046.8 \times 10^{-4}, we can set up an ICE table to solve for [H+][H^+] and then calculate the pH, which should be around 1.81 for a 0.72 M HF solution.

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