# 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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### What is the purpose of using molar conductivity and equivalent conductivity instead of just conductivity [closed]

I am studying about molar and equivalent conductivity, and I just can't understand why. What advantages does it have to complicate things. Is there any simple and direct reason why these are used?
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### Concentration term PPM [duplicate]

What volume do we assume when the concentration is written as mass by volume ppm? I mean when mass by volume percentage is say 20%, we can say that 20g solute is present in 100 ml solution. So if it ...
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### Determining whether precipitation will occur or not and finding the concentration of a specific ion in a solution

The Ksp value of AY2 = 9.148 x 10^-2. I am having problem with calculating the concentration of ions. And without the correct concentration I can't find the Qsp/Kip so I'm stuck without them I can't ...
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### Determination of the chloride concentration by the modified Volhardt method

Would someone help me solve a task: The concentration of chloride ions in aqueous solutions can be determined by the Volhardt method. An excess of silver nitrate is added to the sample containing the ...
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### A silly doubt on the concept of volume percent and concentration

I am trying to solve the following elementary problem of volume percent, however, I am not quite sure where my mistake is: Ethanol has a volume-by-volume concentration of 93.3%. Calculate the volume ...
1k views

### Best regression model for a sigmoidal pattern

Students submit the data for an acid–base titration to my app. The abscissa axis corresponds to the volume. Along the ordinate axis are the pH values. The curve I’m looking for must work automatically ...
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### Finding mole fraction from molarity and density

A solution of H2SO4 with concentration of 2,325 M at 15 °C has a density of 1,140 g/mL. Find the molar fraction. I know what molar fraction is, but I really don't understand how to get it from the ...
487 views

### A method to create NH3-NH4Cl buffer solution using titration method

My aim is to create a basic buffer solution. I know that to create a basic buffer solution, we need a strong acid and weak base. In my case I have chosen $\ce{NH3}$ and $\ce{NH4Cl}$. Using titration, ...
197 views

### How does pressure affect the color of reaction medium with equimolar amounts or reactants and products at equilibrium?

Chlorine gas is pale yellow-green, and both hydrogen and hydrogen chloride are colorless gases. According to the Le Chatelier's principle, the change in pressure will not affect the following ...
530 views

### Molarity 1% ammonia solution?

I have a stock solution of 25% ammonia, with a density of 910 g/L. I used this to make a 1% ammonia solution by mixing 20 mL 25% ammonia into 480 mL distilled water with 5.84 g NaCl (0.2 M), density ~...
Does $\pu{87.4 mL}$ of $\ce{H2O}$ and $\pu{12.6 g}$ of $\ce{HOOC-COOH.2H2O}$ create $\pu{100 mL}$ of a solution? So in our practical class our teacher wanted to make $\pu{100 mL}$ $\pu{1 M}$ aqueous ...
A generic reagent A is considered. The behavior equations of a CSTR reactor is the following: $$\tau = c_\mathrm{A,0} \intop_0^{X_\mathrm{A,final}} \dfrac{1}{-r_\mathrm{A}} dX_\mathrm{A}$$ where \$\...