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Interpretation:
The increase in the density of a solution due to increase in concentration needs to be explained.
Concept introduction:
Density of a solution is the amount of mass present per unit volume of the solution.
Concentration of a solution can be expressed in different units like molarity (M), normality (N), molality (m) etc. Molarity is the number of moles of solute present in 1 L solution.
Normality is the number of gram equivalent of solute present in 1 L of solution.
Molality is the number of moles of solute present in 1 kg solvent.
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Answer to Problem 2E
When concentration increases then density increases as amount of solute present in definite volume of solution increases.
Explanation of Solution
Concentration of a solution can be increased either by increasing the amount of solute or by decreasing the volume of the solution.
When molarity, normality and molality increases for a solution then number of moles of solute per L solution increases. Thus, densirty increases.
Increasing concentration increases amount of solute in certain volume of solution. Thus, density increases.
Chapter U4 Solutions
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