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Sagot :
The mass of dissolved sodium carbonate is 109 g of Na₂CO₃.
What is a solution ?
A solution consists of two elements , a solute and a solvent .
A solute is dissolved into solvent to make a solution.
The concentration of a solution is measure by Molarity , Molality , mass% etc.
It is given in the question that
sodium carbonate ( Na₂CO₃) is sometimes used as a water-softening agent
a worker prepares a 0.724 m solution of Na₂CO₃ and water.
the volume of the solution is 1.421 liters.
Mass of dissolved sodium carbonate is grams =?
Concentration = 0.724 M
Volume = 1.421 liters
Molecular mass of Na₂CO₃ = 106 g
The mass of the solute needs to be determined
Molarity = moles / volume\
moles = Molarity x volume
Substituting the values
moles = 0.724 x 1.421
moles = 1.029
1 mol of Na₂CO₃ means 106 gm of Na₂CO₃
Then 1.029 moles will mean 1.029 * 106
109.07 gm
Therefore , the mass of dissolved sodium carbonate is 109 grams.
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