Hydrofluoric acid (HF) has a Ka value of 7.2 × 10¯ 4.
a. 0.250 mol of F¯ ions (in the form of NaF) are added to 1.00 L of 0.100 mol L¯ 1 aqueous HF. Calculate
the resulting pH.
b. To the solution produced in (a) is added 10.0 mL of 5.00 mol L¯ 1 NaOH. Calculate the resulting pH.
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