100.0 mL 0.15 M aqueous HF (K₁ = 6.8 x 10-4) is mixed with 125.0 mL 0.23 M NaF. What is the pH of the resulting solution

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100 0 Ml 0 15 M Aqueous Hf K 6 8 X 10 4 Is Mixed With 125 0 Ml 0 23 M Naf What Is The Ph Of The Resulting Solution 1 (15.5 KiB) Viewed 30 times

can you please answer my questions in details as i need to
understand in which part am i thinking wrong ?
and if we can solve it by the common effect can you write it
100.0 mL 0.15 M aqueous HF (K₁ = 6.8 x 10-4) is mixed with 125.0 mL 0.23 M NaF. What is the pH of the resulting solution? (A) 2.17 (B) 3.17 (C) 3.35 (D) 3.45 a b с