An aqueous NaCl solution is made using 124 g of NaCl diluted to a total solution...

An aqueous NaCl solution is made using 124 g of NaCl diluted to a total solution volume of 1.05 L .

calculate molarity, caluclate molality. calculate mass percent.

Expert Solution

Molarity = moles/volume in litres

moles = mass / molar mass

124g/58.44 g/mol = 2.12 mol

Molarity of NaCl = 2.12 mol / 1.05 L = 2.02 M

If change in volume is ignored and the density of solution is taken as 1Kg/L

mass of solvent = 1Kg/L x 1.05 L = 1.05 Kg

molality = moles of solute/mass of solvent in Kg

= 2.12/1.05 = 2.02 m

total mass = mass of solute + mass of solvent =0.124 kg + 1.05 kg = 1.174 kg

mass % of NaCl = 0.124/1.174 x 100 = 10.56 %

mass %water = 100-10.56 = 89.44 %

this not very accurate as density of solution needed for exact calculations
it could be done by interpolating with saturated NaCl density to the plain water density

and hence required density of our solution can be obtained

queen_honey_blossom answered 2 years ago

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