All Questions
5
questions
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votes
1
answer
271
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Why are some weak acid equilibrium approximations invalid in very dilute solutions?
Using two approximations for the dissociation of a weak acid, we can write
$$K_\mathrm{a}= \frac{[\ce{H+(aq)}]^2}{[\ce{HA(aq)}]}$$
One of these two approximations we use is that the concentration of ...
- 209
1
vote
1
answer
3k
views
Can an iodine clock reaction work without using a strong acid?
I'm going to do an iodine clock reaction for a project and we had to submit the materials and safety sheets for the experiment a while ago. I thought I could do one by using hydrogen peroxide, sodium ...
- 11
1
vote
0
answers
114
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Is it true that un-dissociated HCl exists in dilute hydrochloric acid?
My book says that the equilibrium constant for $\ce{HCl + H_2O}$ is so high that the reaction goes to completion. But that does not make sense since the existence of an equilibrium constant for this ...
- 333
2
votes
0
answers
2k
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Titration curve, how to find equivalence point
If you have a graphed titration curve and have points near the equivalence point like
6.85 pH at 54.60mL titrant added and
8.01 pH at 54.73mL titrant added
is there any good way to find a more ...
- 21
2
votes
1
answer
4k
views
How to get specific concentration of carbonic acid in solution?
I wanted to know if there is a way of getting specific quantities of carbonic acid? Carbonic acid is water + $\ce{CO2}$ but not all the $\ce{CO2}$ dissolves in water. So if I wanted $5\:\mathrm{g}$ of ...
- 864