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3. 10.6 g of sodium carbonate (Na2CO3) were dissolved in water and the volume of solution made up to 1000 cm3. Which of the following correctly gives the concentrations of sodium (Na) and carbonate (CO) ions? A 0.1 mol dm3 Nat, 0.1 mol dm3 co B0.2 mol dm3 Na, 0.2 mol dm3 co 0.02 mol dm-? Na+, 0.01 mo! dm-3 CO32- 0.1 mo! dm-3 Na+, 0.2 mol dm-??- E 0.2 mol dm3 Na, 0.1 mol dm3 co2-

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loS 9 8 cn 2χ ο.le O2 moke Con ce dation of co3. 2-1 χ o.lo

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