# Questions tagged [concentration]

The concentration characterizes the composition of a mixture with respect to the volume of the mixture. There are mass, amount, number and volume concentrations. Related and within the scope of this tag are normality, molality, mole fraction/ratio, mass fraction/ratio.

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### Deposition of saturated solution and affect of evaporated water

20g of water is evaporated from 200g of saturated solution of KNO3(aq) at 60°C by heating and the solution was cooled to 20°C. How many grams of KNO3 were deposited? The solubility of KNO3 in 100g of ...
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### Effect of water vaporation on saturated solution

At a high temperature, water is evaporated from the saturated solution by heating. What is the solution losing exactly by the fact that the water left the saturated solution? Does it affect its ...
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### When calculating the distance between molecules in a solution, is it reasonable to approximate a sphere around each molecule?

I am attempting to calculate the average distance between molecules in a particular concentration of a solution. My first instinct was to treat the solution as a system of spheres surrounding the ...
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### Deciding whether a precipitate would be soluble in water or not by calculation (problem solving)

This question is purely mathematical, I just could not understand how to approach it. (For reference the question mentions that compounds with solubility higher than 1 mol/L are soluble and insoluble ...
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### Calculating stock solutions

In the question it mentions that the protein forms dimers. Does that affect the RFM of the protein when I use it in my calculations (10kDa). For example for part a, would it just be. 0.01/10, 000 = 1 ...
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### What is the easiest way to concentrate a solution without causing it to hydrolyze?

I’ve been working with iron acetate solutions in dilute acetic acid (vinegar) and I’ve been running into a problem. Every time I try to boil off the solvent the solution hydrolyzes to form iron oxides....
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### A gram of salt added to pure (distilled) water introduces around $2 \times 10^{22}$ ions? [closed]

I am currently studying Practical Electronics For Inventors, Fourth Edition, by Scherz and Monk. Chapter 2.5.2 Resistivity and Conductivity, claims the following: Adding an ionic compound in the ...
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### Did I accidentally create phosgene gas [closed]

I accidentally mixed bleach and acetone trying to remove hair dye stains from my shower wall. The mixture turned orange when the bleach and acetone touched. Could I have created phosgene gas ...
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### Change in concentration when acids are diluted

I came across this formula to calculate the resultant [H]+ concentration when two weak acids are mixed (Both acids of equal volumes are mixed together). The only problem i have with this is that, we ...
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### How to calculate the concentration of reagents and products from Kc? [closed]

In the synthesis of ammonia at equilibrium constant is $K_c = 1.2$ according to the reaction: $$\ce{N2 (g) + 3H2 (g) <=> 2NH3 (g)}$$ If an equilibrium is proposed based on initial ...
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### Determining mol/L at STP from volume and mol fractions in a CFD program

I'm using some CFD software and the outputs are a bit unusual so I thought I would double check my understanding on how to do these conversions. The data available per cell is: cell volume, particle ...
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### Reaction order of a reaction with catalyst

I am given the following $\ce{H2O2 -> H2O + 1/2 O2}$ (catalysed by $\ce{KI}$) There are two solutions. $[\ce{H2O2}]$ is the same in both solutions but $[\ce{I-}]$ is $\pu{0.01M}$ and $\pu{0.005M}$,...