Question

find weight of na2co3 to prepare 100 of its m/20 solution​

Answer 1

Answer:

You should add 5.299 grams of Sodium Bicarbonate in the 100 ml of solvent

you can calculate it using molarity relation

molarity = No. of moles / Liter of solution

Here, you have concentration , volume and molecular mass of Sodium bicarbonate

M = 0.1 , Vol= 0.100 Ltrs , lets assume number of moles = x (remember the units should be in same unit system)

substituting in above formula stated

we got x = 0.05 , now we need 0.05 molecules of sodium bicarbonate to be added in 100 ml so

now change the number of moles to grams

as we know 1 mole of Na2CO3 have molecular mass = 105.98

hence 0.05 moles will be = 0.05 x 105.98 = 5.299 grams

Explanation:

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