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Contest problem I don't know how to solve. I'm exercising for a contest.

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antonioro00071:
The Ph of a solution obtained through the solubilisation at 22°C of 0,365 g HCl, 0,585 g NaCl and 0,70 g NH4OH with water at a final volume of 100 ml (КNH4OH = 1,7×10-5; Kw = 10-14) is:


What I did: Obtained the molar concentration of the HCl, NaCl and NH4OH, I calculated how much NH4OH was left after reacting with HCl. I dont know how to calculate the final pH using the constants.

Hunter2:
Hint: Henderson Hasselbalch  equation.

antonioro00071:

--- Quote from: Hunter2 on April 03, 2024, 06:55:49 AM ---Hint: Henderson Hasselbalch  equation.

--- End quote ---
Thank you a lot, now I have figured this out!

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