Q. 54.1( 208 Votes )

Calculate the mass of sodium acetate (CH3COONa) required to make 500 mL of 0.375 molar aqueous solution. Molar mass of sodium acetate is 82.0245 g mol–1.

Answer :

Given:

Molecular Mass of Sodium Acetate = 82.0245g/mol


Molarity of sodium acetate solution required = 0.375 M


0.375 molar solution of sodium acetate means 0.375g of sodium acetate dissolved in 1000ml of the solution.


But it is given in the question that the solution should be of 500ml.


So, 0.375g of CH3COONa → 1000ml of solution


X g of CH3COONa → 500ml of solution


X



= 0.1875 moles


Mass of Sodium acetate required to make 500ml solution = Number of moles of CH3COONa × Molecular Mass of CH3COONa


= 82.0245× 0.1875


= 15.379g


≈ 15.38g


Therefore 15.38g of CH3COONa is required to make 500ml of solution.

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