What is the ph of the hf solution before base is added 3, Chemistry

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What is the ph of the hf solution before base is added 3

10ML of .010M HF solution titrated with a .010M solution of NAOH at 25Celcius. Ka HF =6.8x10^-4. 1.) How many mL of the base is required to reach the equivalence point? 2) what is the pH of the HF solution before base is added? 3) What is the pH at eqivalence point? 4) what is the pH at 1/2 volume to equivalence point?

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