AP® Chemistry Weak Acid Equilibrium Questions
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- Опубликовано: 27 сен 2024
- Here, we’ll look at some common weak acid equilibrium problems. For more resources, check out tdwscience.com/apchem
Equilibrium questions are some of the most common problems to show up in the free response section of the AP Chemistry text. These weak acid equilibrium problems involve calculating the Ka or acid dissociation constant, and then completing an ICE table, to determine the initial, change, and equilibrium concentrations of the acid and the conjugate base. We then use the Henderson Hasselbalch equation to solve for the concentration of buffer components. This is a calculation that involves the pH as well as the pKa. This buffer solution was made by mixing a weak acid (formic acid) with the sodium salt of its conjugate base.
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Why don’t we put H2O in the ICE table? does it means it does not take part in the reaction?
Because it is liquid and it is not in the Ka expression.
Hi Tyler! This video really helped me, thank you (:
Also, for part b is it possible to just use -lg sqrt (Ka x [H+]) as a short cut? Instead of doing the ICE table? Since [H+] is 0.15 anyway
Thank you!
Always just use the regular formula,you need not to remember all the shortcuts. The major formula could make several shortcuts according to the asked thing in the question.
9:07 why is x negligible? is it a chemistry concept thing (a small Ka would lead to small amount of change) or something more related to arithmetic (since the whole Ka equation is equal to 1.78 x 10^-4, a small value)
You're onto it. Because Ka is so small, we know that the reaction is highly reactant favored, so X has to be very small.
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so what's the answer to question a?
You gotta watch the video! It’s at 3:41
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