Hello,
I keep re-solving number 3 of the Week 2 Assignment: Acid & Base Equilibria, but I keep getting the same answer, which is marked as wrong. When I look at the feedback, I think I'm doing everything right. Is there a key concept I'm missing to solve this problem?
#3 of the Week 2 Assignment: Acid & Base Equilibria
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Re: #3 of the Week 2 Assignment: Acid & Base Equilibria
This is the #3 of the Week 2 Assignment: Acid & Base Equilibria
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Re: #3 of the Week 2 Assignment: Acid & Base Equilibria
Hello!
Attached is my attempt to solve the problem. I'm not sure if my answers are correct because the numbers on question 3 were different. I believe the mistake you made was in your solving of the quadratic equation as our X values were different. One tip I have is to not simplify based on sig figs until the end so that your answer can still be accurate even after multiple calculations and simplifications. Simplifying your answers too much can lead them to be inaccurate, especially after multiple calculations. I hope this helps.
Attached is my attempt to solve the problem. I'm not sure if my answers are correct because the numbers on question 3 were different. I believe the mistake you made was in your solving of the quadratic equation as our X values were different. One tip I have is to not simplify based on sig figs until the end so that your answer can still be accurate even after multiple calculations and simplifications. Simplifying your answers too much can lead them to be inaccurate, especially after multiple calculations. I hope this helps.
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Re: #3 of the Week 2 Assignment: Acid & Base Equilibria
Hi, yeah I think there was a calculation error when you solved for X and used the quadratic equation. The value of X should be 0.00883226. Therefore the percent protonation should be 0.00883226/0.1017 x 100 = 8.68%. To add on, the pH should therefore be -log(x) = 2.05 and the pOH should be 14-pH= 11.95. Hope this helps!
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