All Questions
6
questions
0
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
-2
votes
1
answer
280
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How can I make AgNO3 more basic? [closed]
Is there anything that I can add to the AgNO3 solution that will make it more basic without forming a precipitate such as reacting with OH or HCl?
Please be more specific and give an example.
- 23
1
vote
2
answers
14k
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Titration with Ca(OH)2
In the laboratory, $20.0$ milliliters of an aqueous solution of calcium hydroxide, $\ce{Ca(OH)2}$, was used in a titration. A drop of phenolphthalein was added to it to indicate the end point. The ...
- 205
-2
votes
1
answer
2k
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Why did my iodine clock reaction not work?
For the iodine clock reaction, I'm using Potassium iodide, sodium thiosulfate ($\text{0.05 M}$) and sodium peroxodisulphate ($\text{0.04 M}$) and starch as an indicator. I am varying the concentration ...
- 75
3
votes
2
answers
2k
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Find amount of acid and base required to make buffer
I am wondering if it is possible to know exact amount of acid and base that we can put in together to make a buffer.
I want to make a 0.05 M extraction buffer using disodium hydrogen phosphate (DHP) ...
- 41
12
votes
1
answer
53k
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How do I calculate the concentration of sulphuric acid by a titration experiment with sodium hydroxide?
In my latest chem lab the objective was to create a primary standard of $\ce{NaOH}$ and use it to determine the concentration of sulfuric acid.
The first part of the lab was determine the molarity of ...
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