All Questions
Tagged with aqueous-solution concentration
94
questions
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Preparation of Copper (II) Sulfate Pentahydrate Solution
how would you make a solution of Copper (II) Sulfate Pentahydrate to achieve 150, 200, 250 and 300 mgL−1 concentration of copper? I do not have the anhydrous version of the solute. Also, when I ...
-1
votes
3
answers
2k
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An aqueous solution of NaCl has a mole fraction of 0.21. What is the mass of NaCl dissolved in 100.0 mL of solution? [closed]
Work
mole fraction of NaCl = 0.21/0.21+0.79
If there is 1 mol of total solution, there will be 0.21 mol NaCl and 0.79 mol H2O
0.21 mol NaCl = 12.27 g
0.79 mol H2O = 14.23 g
this would yield a ...
- 31
-2
votes
1
answer
597
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How do I get a 20% ratio of sodium bisulfate with 1 gallon water? [closed]
How many lbs do I add to 1 gallon of water to get a 20% sodium bisulfate ratio? I am in the middle of anodizing some aluminum.... I just threw the whole 3 lbs in... hopefully it works... I ended up ...
- 99
-1
votes
1
answer
65
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Can I have a homogeneous 2 molal solution of copper(II) sulfate at 20 °C?
I'm doing a high school chem project where I am making a calibration curve of copper(II) sulfate for spectrophotometry in which I make solutions with five different concentrations. The most ...
- 73
0
votes
2
answers
35k
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Finding mole fraction from molality
Calculate the mole fraction of ammonia in a $\pu{2.00 m}$ solution of $\ce{NH3}$ in water.
What I know is that the formula for mole fraction is
$$X = \frac{\text{no.-of-moles-of-solute}}{\text{(no.-...
- 113
-1
votes
1
answer
8k
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Does the concentration affect the voltage in electrochemistry?
For my electrochemistry lab I'm using $\pu{10 mL}$ of $\ce{ZnSO4}$ and $\pu{10 mL}$ of $\ce{CuSO4}$ solutions connected with a salt bridge. I connect $\ce{Zn}$ metal and $\ce{Cu}$ metal to a voltmeter ...
0
votes
1
answer
55
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How to meausre ion interferences in solution?
Is there a way to quantitatively measure the interference of different metal ions in solution? I plan to measure concentration of Pb(II), Fe(II), and Cu(II) in solution together using a ...
1
vote
1
answer
2k
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Do we consider the dissociation of water when dealing with ion concentrations of a solution?
One mole of hydrated copper(II) sulfate, $\ce{CuSO4 . 5 H2O},$ is dissolved in water. How many moles of ions does the solution contain?
1) 1
2) 2
3) 6
4) 7
The correct answer is 2. Specifically, I'm ...
- 39
-2
votes
1
answer
297
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Molarity of silver(I) nitrate solution after the reaction with magnesium [closed]
$\pu{3 g}$ of $\ce{Mg}$ are placed in $\pu{500 mL}$ of $\pu{0.625 M}$ $\ce{AgNO3}$. When the reaction is complete, what is the molarity of the $\ce{AgNO3}$ solution?
I'm thinking you need to use $...
0
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2
answers
2k
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Molality of the solution prepared from a hydrated salt [closed]
A solution is made up by dissolving $\pu{13.8 g}$ $\ce{Na2CO3 · 10 H2O}$ in $\pu{103.5 g}$ of water. What is the molality of $\ce{Na2CO3}$ in this solution?
I can't solve it. I tried converting to ...
- 17
3
votes
2
answers
25k
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Electrolysis of diluted sulfuric acid
My teacher told me that electrolysis of dil. $\ce{H2SO4}$ (concentration below $50\%$) using inert electrodes results in gradual increase of the concentration of $\ce{H2SO4}$.
I can't seem to figure ...
- 141
3
votes
2
answers
1k
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How to calculate molarity and the number of molecules for a mixture in a simulation box?
I want to do a simulation of a mixture which consists a total of $512$ molecules of glycine, ammonia, and water molecules mixture in a cubic box of, say, length $\pu{2.6 nm}$; $\pu{2.6 nm}^3 = \pu{17....
- 49
1
vote
1
answer
585
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Calculating weight of soluble salt in a solution
I got a solution which density is $\pu{1.035 g mL-1}$ and it contains soluble salt $\ce{Ba(NO3)2}$ at concentration of $\pu{0.250 M}$. The teacher is asking from me to "clear" the solution from the $\...
- 305
2
votes
0
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48
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Should the concentrations in weight % of the components of a solution always add up to 100%?
There's a paper with this statement of a alkaline solution:
Nanostructured CuO films were formed by immersing the cleaned tabs into a hot $(\pu{96 \pm 3 ^\circ C})$ alkaline solution composed of $\...
- 29
3
votes
0
answers
1k
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Calculating total volume mixing NaCl and water
I'm (as a non chemist) trying to calculate the the volume of a NaCl solution. The problem is that I know the volume of water prior to mixing in NaCl, but I want to know the volume of the solution ...
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