Answer to Question #65531 in Inorganic Chemistry for samuel

Question

21g of sodium carbonate is dissolved in water and the solution made up to 500cm cube. Find the molarity of the solution. Naco3

Answer 1

C = n_subst. / V_sol. (moll/L)

500 cm 3 = 500 ml = 0.5 L

M(Na 2 CO 3 ) = 2×23 + 12 + 3×16 = 106 g/moll

n(Na 2 CO 3 ) = 21/106 = 0.2 moll

C(Na 2 CO 3 ) = 0.2/0.5 = 0.4 moll/L

Answer: 0.4 moll/L (Na 2 CO 3 )