All Questions
14
questions
0
votes
0
answers
21
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Dissolution of portlandite, calcite/CaCo3 phase and C-S-H due to high pH
I would like to ask about the possibility of the partial dissolution, over curing time, of portlandite, CaCo3 and C-S-H phases due to high pH (12.5 - 13) of the lime-clay-water systems (lime-...
- 1
2
votes
0
answers
230
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Why is it recommended to not store commercial sodium silicate solutions in direct sunlight, what are the effects of doing so and can it be modelled?
I regularly purchase aqueous sodium silicate solutions from commercial providers for my studies and note that a storage recommendation for all different grades (i.e. differing $\ce{SiO2 / Na2O}$ ...
- 500
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
0
votes
2
answers
194
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What might cause overestimated measured pH value of sodium hydroxide solution pumped with carbon dioxide?
I tried an experiment at home where I had a $\ce{CO2}$ tank pumping $\ce{CO2}$ into a solution of $\pu{28 g}$ sodium hydroxide in $\pu{200 ml}$ water. The initial $\mathrm{pH}$ was $11.24.$
I expected ...
- 59
0
votes
1
answer
1k
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How to make silicic acid, potassium silicate or calcium silicate?
I am a student of tropical agriculture. I am taking the class of agronomic chemistry and plant nutrition. I want to make use of silicate source I have at home for e.g. zeolite, wood ashes, ...
-2
votes
2
answers
465
views
How Do I Determine The Strength Of Two Ammonia Solutions Using Titration Methods? [closed]
Two housewives disagreed on the strength of an ammonium cleaning agent. Housewife A thought that her brand was more effective than the brand used by housewife B. Plan and design an experiment that ...
- 3
6
votes
1
answer
170
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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 ...
0
votes
1
answer
8k
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Solubility of potassium nitrate and potassium chloride
Why more water is needed to dissolve potassium chloride than potassium nitrate of equal amount? Is it to do with the reaction that occurs when the compounds dissolve or the properties of the compounds?...
2
votes
1
answer
3k
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How can I make a fairly saturated copper (II) sulfate solution by heating?
I have an investigation to do for my chemistry class. I'm looking at copper complexes and using ammonia to create a precipitate in the copper (II) sulfate solution, then redissolving the precipitate ...
- 196
2
votes
3
answers
3k
views
Identifying MgCl2 or CaCl2 in solution
I have an aqueous solution of either $\ce{MgCl2}$ or $\ce{CaCl2}$ in solution with $\ce{K2SO4}$. There is a white precipitate that forms on the bottom that does not dissolve when $\ce{HCl}$ is added (...
- 35
1
vote
1
answer
7k
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finding cation of unknown salt in solution from precipitate
I should probably add that I was originally given an unknown solid mixture of 2 salts. I separated the insoluble salt out by centrifuging and then decanting. I found that the insoluble salt is $\ce{...
- 35
2
votes
3
answers
7k
views
How to convert sodium aluminate back to sodium hydroxide?
I had dissolved a bunch of aluminium foil in an aqeous solution of sodium hydroxide. The resulting solution consists mainly of sodium aluminate with very little excess sodium hydroxide.
What I want to ...
- 563
4
votes
1
answer
286
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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
1
vote
2
answers
10k
views
How is iron(III) chloride changed from solid to solution?
I'm conducting an experiment using iron(III) chloride in aqueous solution, but am also aware that it's usually a solid.
How is iron(III) chloride experimentally converted to a solution?
And can you ...
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