All Questions
20
questions
2
votes
2
answers
145
views
In an unsaturated solution, is the product of ions still equal to Ksp?
Suppose I have a solution of a sparingly soluble compound, and consider its solubility in g/L. If I have less g/L of solution than that amount, it means the solution is unsaturated, but what happens ...
- 67
-5
votes
1
answer
59
views
Why is 10 times phosphate-buffered saline more acidic (~6.9) than 1 time phosphate-buffered saline (~7.4)? [closed]
Recently, I've been told that similar pH shift (of about 0.5 units) was observed with 20 times NPS solution as well.
In case of NPS the authors provide the following recipe for the 20 times solution:
...
- 111
1
vote
0
answers
52
views
How to calculate pH resulting from dissolving a salt in water? [closed]
The main question is how to calculate the changes in pH after dissolving a salt in water.
Suppose we dissolve 1 gram of magnesium carbonate (MgCO3) in 1 liter of Water. This will result in (...
- 11
-2
votes
1
answer
1k
views
Is mixture of ammonium hydroxide and ammonium nitrate a buffer solution? [closed]
Is a mixture of $\ce{NH4OH}$ and $\ce{NH4NO3}$ a buffer solution?
I have seen some examples with $\ce{NH4OH}$ and $\ce{NH4Cl}$ but never $\ce{NH4NO3}$.
- 1
0
votes
4
answers
572
views
How many grams of sodium phosphate must be added to precipitate as much of one ion as possible?
Problem text:
Solid sodium phosphate is slowly added to $\pu{200 mL}$ of a solution containing $\pu{0.002 mol}$ of aluminum chloride and $\pu{0.001 mol}$ of calcium chloride (assuming no volume ...
- 111
1
vote
1
answer
2k
views
Using solubility product to determine the mass of the precipitate of a reaction
I mix together $\pu{100 mL}$ of an aqueous $\ce{NaCl}$ solution at $\pu{0.5 M}$ and $\pu{100 mL}$ of an aqueous $\ce{AgNO3}$ solution at $\pu{0.3 M}$. Assuming that the solubility of $\ce{NaCl}$ in ...
- 11
1
vote
0
answers
78
views
What is the precipitate of aqueous copper (II) and polysulfides?
So if you heat up a piece of sodium engulfed in a large excess of sulfur, what you would get (from what I've read) is sodium polysulfide $\ce{NaS_n}$. But how large can $n$ get? If you left sodium ...
- 11
-3
votes
2
answers
306
views
How does one dilute sulphuric acid (1.28sg@25ºc 460g/L) to 3 M Sulphuric Acid?
Thanks for looking.
The extent of my research around the issue so far.
SA sg table but wrong temp 60f not 77f/25c
http://www.sschemical.com/wp-content/uploads/2013/05/Conversion_Table.pdf
From
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1
vote
1
answer
166
views
Reactions between Ca(OH)2 and CO2, and Sr(OH)2 and CO2
So I'm doing an investigation, and it involves using supersaturated solutions of Ca(OH)2 and of Sr(OH)2. I notice that there's always a flaky precipitate formed on top. I need to know about the ...
- 11
10
votes
4
answers
2k
views
Ionic compound having highest solubility in water
Which ionic compound has highest solubility in water? I can find CsBr having highest solubility with 1230 g/L at 25 °C.
Note: compounds like ethanol are soluble to any extent in water, but they are ...
- 1,693
-2
votes
1
answer
67
views
Peroxide without hydrogen [closed]
How come we always see hydrogen peroxide and never peroxide by itself. Is there such a thing as peroxide ? Does this exist in nature? Why is hydrogen always associated with it? Please note: First ...
- 435
5
votes
2
answers
5k
views
Is lithium bicarbonate an aqueous solution of lithium carbonate?
This question is related to:
Are Lithium bicarbonate and Magnesium bicarbonate both soluble in water?
What type of chemical reaction is this?
How can bromine water be called a solution?
In the ...
- 26.3k
2
votes
1
answer
6k
views
What does K3Fe(CN)6 become?
What does the salt $\ce{K3Fe(CN)6}$ change to when it is dissolved in water? I mean, I think its going to ionize, but in what way? Is there a way to know this? I tried to search the web but wasn't ...
- 411
2
votes
1
answer
3k
views
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
13
votes
2
answers
10k
views
Should bromine water be called a solution?
Bromine water is a reagent which is used to test for unsaturation in organic compound. It is $2.8~\%$ bromine in water. In many places, it is refer to as bromine solution.
But it is observed that ...
- 26.3k