Prepare 200 ml (m/20) aq solution of na2co3 (with explaination please)

1.	Prepare 200 ml (m/20) aq solution of na2co3 (with explaination please)
Answer» MOLARITY = no. Of moles of solute/ litre of solution SINCE 100ML = 0.1 L Therefore , 0.5 = no. of moles of solute/ 0.1 Hence,No. of moles of solute = 0.05 moles. But , no. Of moles = mass of substance/ molecular mass of substance So , 0.05 = mass of substance/ 106 = 5.3 Hence , mass or amount of sodium carbonate in litre of solution is 5.3 Calculation of molecular weight of sodium carbonate , = 23 2 + 121 + 16 *3= 106.

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