Answer to Question #203281 in Inorganic Chemistry for hibah

Question

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

Answer 1

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

Now see, 10% Na2CO3 means

100gram solution contains 10gram Na2CO3

Meaning ;

Mass of solute=10 g

Mass of solvent= 100–10=90g

Molar mass of Na2CO3=106g