Question: What pH will occur when a solution is made of 250ml of 0.1M acid and 50ml of 0.2M base (pKa= 3.86)? Answer: 3.46 For solving......why

What pH will occur when a solution is made of 250ml of 0.1M acid and 50ml of 0.2M base (pKa= 3.86)? Answer: 3.46 For solving......why do we convert to moles and put the moles into Henderson Hasselbalch instead of plugging in the already given molarities? If you plug in the molarities instead of moles you get 4.16 which is incorrect. Why?

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