Question
Asked Oct 31, 2019
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What is the molarity of a 3.43 m solution of KCl dissolved in water, given that the solution has a density of 1.13 g/mL?

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Expert Answer

Step 1

Molarity is defined as the ratio of number of moles of solute to the volume of solution is liters. The S.I. unit if molarity is molar and is represented by ‘M’. Mathematical formulation of molarity is shown as follows:

moles of solute
Molarity
volume of solution (in L)
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moles of solute Molarity volume of solution (in L)

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Step 2

Molality is defined as the ratio of number of moles of solute to the mass of solvent in kilograms. The S.I. unit if molality is molal and is represented by ‘m’. Mathematical formulation of molality is shown as follows:

moles of solute
Molality
mass of solvent (in kg)
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moles of solute Molality mass of solvent (in kg)

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Step 3

As per the given data in the question,

Molality of KCl solution, m = 3.43 m

Density of KCl solution = 1.13g/mL

Molecular weight...

1000M
m =
p- M(Molarmass)
here,m molality
M molarity
p= density
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1000M m = p- M(Molarmass) here,m molality M molarity p= density

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