All Questions
Tagged with aqueous-solution experimental-chemistry
61
questions
12
votes
3
answers
38k
views
Differentiation between zinc, aluminium, and magnesium ions in solution
If I have three aqueous ionic solutions in which I know that the cation is $\ce{Al^3+}$, $\ce{Mg^2+}$, or $\ce{Zn^2+}$, how do I find out which is which?
I was thinking to add $\ce{OH-}$ in the form ...
- 223
8
votes
3
answers
2k
views
How much salt (or any other substance one can find in a kitchen) do I need to add to make water boil at 104 °C?
I've seen some formulas around in other questions and Google searches, but my chemistry is pretty much dead so I have no clue where to find the relevant values to calculate it myself. I just need to ...
- 97
7
votes
1
answer
1k
views
Is there a material that ions can pass through but water can’t?
I was wondering whether there is a material that can pass ions (such as the ions existing in seawater) but not water. I am aware that water molecules are smaller, so they can pass through some ...
- 223
6
votes
1
answer
170
views
How do you experimentally calculate the ionization constant of the carbonate ion?
Given sodium hydrogen carbonate, $\ce{NaHCO3}$, as well as hydrochloric acid, $\ce{HCl}$, how would you experimentally determine the ionization constant for the carbonate ion, $\ce{HCO3-}$? By ...
6
votes
2
answers
302
views
How to weight picric acid?
Picric acid is stored under a layer of water to prevent an explosion.
What is the right way to measure the amount of picric acid that taken out? It is wet and containing water.
- 171
6
votes
2
answers
580
views
How to choose the correct volumes when preparing a dilution series?
Original Question
A solution of dye, Amido Black 10B dye ($10~\mathrm{mM}$, $6.165~\mathrm{g\over L}$), as-provided absorbs light much too strongly for measurement of an absorbance value. It is ...
- 61
5
votes
3
answers
18k
views
Best way to dissolve/emulsify beeswax and carnauba wax in water-based solution
What I can use to dissolve beeswax and carnauba wax and keep it in an aqueous solution? I do not want to use ethanol or acetone as they are too harsh.
I am adding about $\pu{5\%}$ wax to a $\pu{16oz}$...
5
votes
1
answer
636
views
Electrolysis of water for demonstration: ideal electrolyte for safety, stability, conductivity, and ease of maintenance
I'm developing a system for educational purposes where electrolysis of water takes place. The aim is to practically show how electrical energy can be converted to mechanical, by electrolyzing water, ...
- 153
4
votes
2
answers
2k
views
Diluting down solutions method
I'm designing an experiment and it involves testing various concentrations of solutions, and I will be testing 5 in total. I proposed to make up a stock solution, and distribute it evenly in 5 ...
- 457
4
votes
1
answer
62
views
Would having a greater H-bond donor count make a substance more readily enter a twig?
Yes, weird plant scientist asking weird plant questions...
Background:
I am looking at how the twigs of trees absorb water, a poorly understood means by which trees alleviate water stress. Of 4 ...
- 41
4
votes
1
answer
1k
views
How can I calculate the molar conductivity of a solution with multiple solutes?
I'm running an experiment mixing 2 different solutions, $\pu{5 mL}$ of $\pu{0.1 M}$ $\ce{NaCl}$ with $\pu{5 mL}$ of $\pu{0.1 M}$ $\ce{KCl}$. I am measuring the conductivity of the total solution in $\...
- 41
4
votes
1
answer
4k
views
Temperature change and gas evolution for vinegar and baking soda experiment
This is sort of 2 questions in 1, but I think they are related.
Could someone please explain why this endothermic reaction doesn't further decrease the temperature when the amount of baking soda is ...
- 43
4
votes
1
answer
286
views
How do I make a dysprosium chloride solution from dysprosium oxide?
I know that dysprosium oxide is insoluble in water.
I was told that I need to add concentrated $\ce{HCl}$ to the compound and then evaporate the $\ce{HCl}$ off. From looking at the reaction equation, ...
- 41
4
votes
0
answers
86
views
Notation for spectral density in experimental community
In an open quantum system setup where the system is coupled to infinite harmonic oscillators as bath (as in the Caldeira leggett model, for example), through the Hamiltonian,
$$H = \frac{\hat{p}^2}{2m}...
- 91
3
votes
2
answers
11k
views
Why would a solution of FeCl2 appear brown/yellow sort of like FeCl3?
If we prepare a solution of $\ce{FeCl2}$ by dissolving solid $\ce{FeCl2}$ powder in water, supposing the bottle of $\ce{FeCl2}$ was left open for sufficient time, is it possible for $\ce{FeCl2}$ to ...
- 318