How many g of sodium carbonate (molecular mass = 106) should be dissolved in 100 ml of water to make a 0.15 M solution?

1 Answer
Apr 8, 2018

1.59 g of #Na_2CO_3#

Explanation:

#Molarity# = #"moles of solute"/"volume of solvent"#

PURPOSE
To use molarity concept (mol/L) to determine the mass of sodium carbonate.

#0.15 "mol"/L# = #(Na_2CO_3)/"0.100 L"#

Solving,

#Na_2CO_3# = 0.015 mol

Finally, converting moles to grams:

#("106 g"/cancel"mol")## 0.015 cancel"mol"# = 1.59 g of #Na_2CO_3#