All Questions
Tagged with aqueous-solution analytical-chemistry
50
questions
7
votes
1
answer
11k
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Why does phosphoric acid mask the colour of iron(III) complex in water?
In the redox titration of iron(III) with permanganate or dichromate, we use phosphoric(V) acid to "mask" the color of iron(III) because it interferes with the end point color change.
What's the ...
- 115
6
votes
1
answer
7k
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Difference in calculated pH and the real pH of a phosphate buffer
I want to prepare a buffer system with $\mathrm{pH} = 7.00$ and a total concentration $c_\mathrm{tot} = \pu{0.10 mol l^-1}$ using sodium hydrogen phosphate $(\ce{Na2HPO4})$ and sodium dihydrogen ...
- 71
4
votes
1
answer
164
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Best x-ray dopant?
An x-ray computed tomography scanner has been used in an attempt to look at the pore space of a limestone rock sample (a carbonate, $\ce{CaCO3}$) saturated with a $\mathrm{12\ wt\%}$ sodium iodide ($\...
- 187
3
votes
3
answers
3k
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What is the procedure to create stock solutions?
Until now to execute this recipe, each time i had to count those milligrams/Liter. An enough difficult procedure.
I am posting here this question to help me understand the procedure of creating ...
- 159
4
votes
3
answers
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Are refractive or density based Brix meters better for use with alcoholic drinks?
Assume that somebody wants to measure the sugar content of a liqueur. It seems that there are two types of Brix meters for it, ones which use the solution density and ones which use refraction of ...
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