Answered

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2. A student was asked to make up a 10% w/w solution of sodium carbonate. Calculate the amount of solute and solvent required to prepare that solution?
please explain step by step

Sagot :

Histrionicus

Answer:

The amount of the solute and solvent can be calculated by the molality. The equation for the molality is as following:

Molality= (mass of solute*1000)/(molar mass*mass of solvent)

it is given that, 10% of Na2CO3 is made,

It means 100gram solution contains 10gram Na2CO3

So, the Mass of solute = 10 gram

then,

Mass of solvent= 100–10 = 90 gram

And, the molar mass of the Na2CO3 = 106 gram

from, now with the help of formula, we can calculate the amount of solute and solvent.

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