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This tag should be applied to questions relating to the theory, design, techniques or performance of chemical experiments. This includes but is not limited to theoretical structures, expected products, thermal calculations, and empirical analysis. Additional tags should be applied to narrow down the field of research.

3
votes
Since you want the distillate, use the following setup. This way if the water pressure drops then the water is sucked into the trap flask, not the distillate.
answered Oct 31 '17 by MaxW
2
votes
Use counter-current extraction. I'm not sure about solvents, but let's say that I can separate nitromethane from water by distillation. Also that butanol can be separated from ether by distillation. …
answered Feb 9 '17 by MaxW
2
votes
The $\mathrm{pK}_{a3}$ of phosphoric acid is 12.319 according to Wikipedia. So at a pH of 11 most of the phosphate species would be in the form of $\ce{HPO4^{2-}}$. Thus as $\ce{Ca3(PO4)2}$ precipitat …
answered Jan 7 '18 by MaxW
1
vote
Generally a specification like 3% of potassium sulfate is wt%. Such a solution would have 30 g in a about a liter of water (weighing 1 kilogram). $$30/1030 = 2.91 \%$$ which should be close enough. Yo …
answered Mar 28 '16 by MaxW
1
vote
Green isn't due to an copper oxide but rather copper(II) carbonate-hydroxide, $\ce{Cu2CO3(OH)2}$. The mineral is known as malachite.
answered Oct 31 '18 by MaxW
25
votes
The question itself is poorly written as given. The diagram should have "regions" and "points." So what seems to be labeled "Region 2" and "Region 4" I would name as "Point 2" and "Point 3" resp …
answered Mar 22 '18 by MaxW
2
votes
Wikipedia is your friend...Zinc Acetate Decomposes at 237 °C (459 °F; 510 K) (dihydrate loses water at 100 °C) So heating to 120-130 °C for several hours would remove the water, but …
answered Feb 25 '17 by MaxW
0
votes
$\%\text{RSD}_{X1} = \sqrt{\%\text{RSD}^2_{X2} + \%\text{RSD}^2_{Y2} + \%\text{RSD}^2_{Y1}}$ For multiplication and division the error propagates as the % relative standard deviation. This ignores …
answered Feb 8 '17 by MaxW
1
vote
In such experiments you typically run a blank. So add the homemade activated charcoal to just some water, filter, then titrate that filtrate as a blank. There are two possibilities for the increase. …
answered Jan 2 '16 by MaxW
1
vote
I don't think you have really explained the experiment correctly. I'd guess that you're using a diluted solution of sulfuric acid. $\ce{Zn + H2SO4 ->[H2O] ZnSO4 + H2 ^}$ It would be difficult to hav …
answered Sep 17 '16 by MaxW
0
votes
This is sort of odd so I'm just going to propose a solution. You really have to assume some quirky chemistry and a bit of logic puzzle analysis to "solve" this problem. I think this is the sort of …
answered Nov 3 '15 by MaxW
0
votes
Possibly, but the rational is a bit convoluted. First, as you noted there is a fundamental difference between precision and accuracy. You explained the difference correctly. Now let's think of a hy …
answered Oct 24 '15 by MaxW
4
votes
Actually the % error is calculated as: $\frac{\text{experimental} - \text{actual}}{\text{actual}}\cdot100\%$ That way if experimental < actual then the error is negative if experimental > actual …
answered Feb 4 '17 by MaxW
1
vote
What makes the answer to this questions B rather than A? I think that the two temperatures should be somewhat close to each other, but is there some intricacy to this that I am missing? The factor th …
answered Mar 18 by MaxW
2
votes
0answers
A recent question about the velocity distribution of ideal gas molecules got me wondering. How much would the velocity distribution vary for non-ideal gases? I was wondering about a mixture of ethan …
asked Feb 26 '18 by MaxW

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