Answer to Question #202416 in Inorganic Chemistry for mein nhi batari

Question

1.     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? 

Answer 1

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

Now see, 10% Na2CO3 means

100gram solution contains 10gram Na2CO3

Means

Mass of solute=10 gram

Mass of solvent= 100–10=90gram

Molar mass of Na2CO3=106gram

Hence putting values in formula we get