# 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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### Calculate concentration of reactant from the absorbance of product without molar absorptivity

I am given the reaction A → B, where the absorbance of the product B has been measured (see picture below). The initial concentration of A is $10^{-4}$ M. From the answer it is stated that one should ...
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### Calculate rate constant of second order reaction and pseudo first order reaction

The reaction A + B -> Prod follows the second order kinetics. In an experiment, you initially have ten times as much B as A. The concentration of A varies with time according to the following data: ...
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### The theoretical gradient of the nernst equation when changing concentration and measuring cell potential

How would I determine the theoretical gradient of the comparison of concentration vs cell potential. I am doing an experiment on this and achieved the experimental gradient but unsure as to how to ...
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### Salt extraction from water without affecting mercury concentration

I am looking to theoretically bio-analyze a water sample regarding its mercury concentration from both sea and lake water using a biosensor with an enzyme biorecognition element. However, a big issue ...
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### Will the rate of the reaction of discoloration of crystal violet change if I vary the concentration of crystal violet?

I'm trying to find a relationship between the concentration of crystal violet (limiting reagent) and the rate of reaction in the hydroxide medium. I've only seen examples of experiments varying the ...
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### HCl labeled 31.45% concentration (20° Baume) [closed]

Just bought a standard concentration of HCl solution. The 31.45% is weight-by-weight & not weight-by-volume, correct?
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### How would I find what specific wavelength I need to measure for a specific chemical in spectrophotometry (calcium perchlorate)?

I am currently doing a research project, and for it, I would like to use a photospectrometer to find the concentration of Calcium Perchlorate in my sample solutions. My current method of data ...
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### Is the wavelength of light generated through a chemical reaction independent?

The chemical reaction in question is the reaction between Luminol and hydrogen peroxide. Is the wavelength of light generated through this reaction dependent on the concentration of either reactant? I ...
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### Why does mercury(II) nitrate form only when using concentrated nitric acid?

In the reaction between mercury and nitric acid, mercury(II) nitrate only forms when concentrated nitric acid is heated up and added to it, if the acid is dilute, mercury(I) nitrate forms. I ...
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### Osmolality and osmolarity of infant formula

Actually, this question is about the following sentence, which I have seen (in various forms) in numerous papers (e.g. this one and this one): The American Academy of Pediatrics advises that formulas ...
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### Calculate concentration of product after time passed

If I have two parallel reactions: A --> P$1$ (k$_1$ = $0.00010$ s$^{-1}$) A --> P$2$ (k$_2$ = $0.00050$ s$^{-1}$) and know that the initial concentration of A is $0.0417$ M. How can I ...
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### Calculating the concentration of reactants and products in parallel reactions after a time t

A substance A reacts with a solvent B to form an intermediate product IP. The reaction is bimolecular. The conc. of the solvent is constant at $12$M. IP can then react to form the two products P$1$ ...
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### Total concentration conversion

when dealing with waste water and the total values of P, N, C are given in ppm units, what molecular weight is used for converting from ppm to molar? for Example- what will be 12 ppm of P(T) in Molar ...
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### More ions form pairs when concentration of acid increases, does that decrease the speed of reaction?

Electrical conductivity decreases as an acid becomes more concentrated because more ions form pairs. However, does that affect the speed of reaction of the acid as there is a smaller concentration of ...