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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: ryan0927 on August 30, 2021, 09:03:31 PM

Title: Problem with finding the equation for a buffer solution
Post by: ryan0927 on August 30, 2021, 09:03:31 PM: An experiment I am planning requires me to prepare an alkaline buffer solution, and I found some sources that said one of 0.1 mol NaHCO₃ and 0.1 mol Na₂CO₃ dissolved in 0.5dm³ distilled water would give a pH value of 9.7. I am not sure how I should find the equilibrium equation for this, as I am not very familiar with such buffers with two salts, as opposed to only one. Thank you in advance for any advice!
Title: Re: Problem with finding the equation for a buffer solution
Post by: Babcock_Hall on August 30, 2021, 09:14:56 PM: A good general piece of advice is to start by writing a balanced equation. In this case, I would write an acid dissociation equation.
Title: Re: Problem with finding the equation for a buffer solution
Post by: ryan0927 on August 30, 2021, 11:25:44 PM: Quote from: Babcock_Hall on August 30, 2021, 09:14:56 PM
A good general piece of advice is to start by writing a balanced equation. In this case, I would write an acid dissociation equation.

How would you do this if there are two salts, though?
Title: Re: Problem with finding the equation for a buffer solution
Post by: Borek on August 31, 2021, 03:17:21 AM: Do you understand how buffers work? You need a conjugate pair: acid and a base. What will be the acid, what will be the base in your case?