An aqueous solution contains 28% w/w of KOH. If the density of the solution is 1.2 gm/ml, then calculate the :
1.) Molarity
2.)Molality
3.) %w/v
4.)Mole fraction of KOH
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1) The molarity measured is .
2) The molality measured is .
3) The W/V % measured is .
4) The mole fraction of measured is .
Explanation:
Data given,
The concentration ( W/W % ) of =
The density of the solution = =
As given , then of in of solution.
Therefore,
The mass of ( solute ) =
The mass of water ( solvent ) = = =
As we know,
- The density of solution =
- The volume of solution = = or
1) Molarity
As we know,
- Molarity =
The molar mass of =
Now, the number of moles of , = = =
Thus,
- Molarity = =
2) Molality
As we know,
- Molality = = =
3) W/V %
- W/V % =
- W/V % = =
4) Mole fraction of
As we know,
- Mole fraction of =
Now we have to find out the number of moles of water.
The molar mass of water =
Therefore,
- = = =
Thus, the mole fraction of = = .
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