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Chemistry Forums for Students => High School Chemistry Forum => Chemistry Olympiad and other competitions => Topic started by: antonioro00071 on April 03, 2024, 05:44:55 AM

Title: Contest problem I don't know how to solve. I'm exercising for a contest.
Post by: antonioro00071 on April 03, 2024, 05:44:55 AM

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 (К_NH4OH = 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.

Title: Re: Contest problem I don't know how to solve. I'm exercising for a contest.
Post by: Hunter2 on April 03, 2024, 06:55:49 AM

Hint: Henderson Hasselbalch  equation.

Title: Re: Contest problem I don't know how to solve. I'm exercising for a contest.
Post by: antonioro00071 on April 03, 2024, 07:36:00 AM

Quote from: Hunter2 on April 03, 2024, 06:55:49 AM

Hint: Henderson Hasselbalch  equation.

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