Question

What is meant by the concentration of a solution? Give its formula and write the names of four units of concentration.
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Answer 1

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Answer 2

Answer:

concentration of a solution - The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution.

Molarity- It is one of the most widely used unit of concentration and is denoted by M. It is defined as no. of moles of solute present in 1 liter of solution.

$molarity = \frac{No.~of~moles~of~solute}{Volume~of~solution(in~Litres)}$

Mass Per Cent or weight percent (w/w %)

It is the ratio of the mass of solute to the mass of solution multiplied by 100 to calculate mass percent. It is also known as weight percent and is represented by (w/w %). You may have seen this symbol on the back of medicines and tablets. It is one of the most commonly used units of representing concentration.

Mass per cent = $\frac{Mass~of~solute}{Mass~of~solution}~\times~100$

Molality

It is defined as moles of solute present in 1-kilogram of solvent. It is denoted by m.

Molality, m = No. of moles of solute/Mass of solution(in kg)

Mole Fraction

The mole fraction or molar fraction (xi) is defined as the amount of a constituent (expressed in moles), ni, divided by the total amount of all constituents in a mixture (also expressed in moles), ntot:

$x_i=\frac{n_i}{n_{tot}}$

Explanation:

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