All Questions
Tagged with aqueous-solution reaction-mechanism
34
questions
2
votes
1
answer
1k
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What is the minimum operating temperature of chemical hand warmers?
I have been looking at chemical hand warmers such as Hot Hands, Grabber and HotSnapZ. Unfortunately, I cannot find a minimum operating temperature for these types of devices. Logic tells us that they ...
- 121
5
votes
1
answer
7k
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Why is copper(II) sulfate added drop by drop during the Biuret test?
The Biuret test is a test for proteins. The procedure is to add a strong base, such as NaOH, to dissolve the protein. After that, copper(II) sulfate is added drop by drop into this until a (violet) ...
- 235
1
vote
1
answer
2k
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Why do nonmetal oxides react with water to form acidic compounds? [closed]
I am confused about the molecular basis by which nonmetal oxides react with water to form acidic compounds. For example, I understand that sulfur trioxide reacts with water to form sulfuric acid as ...
- 811
1
vote
3
answers
3k
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How to determine if an unknown is potassium chloride or potassium bromate?
In class, we were given unknown substances. I've narrowed the possible substances down to either potassium chloride or potassium bromate.
We were given several acids, indicators, and other chemicals (...
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-1
votes
2
answers
7k
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KCl + CuCl2 in solution, is there a reaction?
I'm wondering if the reaction of $\ce{KCl + CuCl2}$ in solution (aq) will produce any products (have a net ionic equation/solid precipitate)?
Using the metal activity series, I see that potassium is ...
- 9
7
votes
1
answer
1k
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Does acid and base react directly, or do they react first with water?
If an acid $\ce{AH}$ reacts with a base $\ce{B}$ in aqueous solution, in textbook they write
$$\ce{AH + B -> A- + BH+}\label{rxn:1}\tag{1}$$
But first I add acid to water and then base, so why ...
4
votes
1
answer
798
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How would an increase in the concentration of a sucrose solution affect the rate of its acidic hydrolysis?
Regarding the acidic hydrolysis of sucrose
$$\ce{\underset{sucrose}{C12H22O11} + H2O + \underset{catalyst}{H+} -> \underset{glucose}{C6H12O6} + \underset{fructose}{C6H12O6} + H+},$$
I think ...
- 71
3
votes
0
answers
160
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Chemistry Behind TMOS Aerogel
I have found out how to make silica aerogel.
Currently, the solution that I need to create to make the gel requires tetramethyl orthosilicate or TMOS. Furthermore, the procedure requires me to make ...
- 131
1
vote
1
answer
4k
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How can I predict whether a reaction will occur? [duplicate]
I'd like to know how can I predict if two substances will react. I already know that there's a reaction if one of the products is a weak electrolyte or a precipitate but that leads me to the question: ...
- 11
10
votes
1
answer
10k
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How does the HCl-KCl Buffer work?
I have just been studying the $\ce{HCl}$-$\ce{KCl}$ 'buffer', but there are still quite a few things I am uncertain about. I would appreciate any help in clearing up some questions I have.
What I ...
- 445
0
votes
1
answer
391
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Sodium Silicide (NaSi) Synthesis, Reversability
I'm trying to understand a) the reaction that would produce $\ce{NaSi}$ from $\ce{Na}$ and $\ce{Si}$, as well as how to reverse the reaction of $\ce{NaSi}$ with $\ce{H2O}$. The product of the latter ...
- 61
1
vote
1
answer
4k
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Why do fluoride ions "win" over thiocyanate ions in a solution with iron ions?
When you mix aqueous iron(III) nitrate and potassium thiocyanate together you get a red solution. Then if you add sodium fluoride, the red colour disappears.
This is basically because the $\ce{Fe(...
- 127
2
votes
1
answer
2k
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Why does cotton dissolve in a dilute solution (1/2) of fuming sulfuric and nitric acids?
A nitration experiment carried out showed that a solution of half diluted sulfuric and nitric acids would turn the submerged cottons into a gooey substance. The remnants of the cotton balls did not ...
- 21
7
votes
3
answers
150k
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Reaction between NaOH and CO2
So I wanted to know what the reaction between sodium hydroxide and carbon dioxide can be, and upon research I got 2 answers. The first one is
$$\ce{CO2 + NaOH(aq) -> NaHCO3(aq)}$$
and the second ...
- 864
14
votes
1
answer
10k
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Why does Mg react vigorously in NaCl solution and less so in water?
When you put $\ce{Mg}$ into water a few $\ce{H2}$ bubbles appear. But when you put $\ce{Mg}$ into a $\ce{NaCl}$ solution there is a vigorous release of $\ce{H2}$, why is this and what reactions are ...
- 141