Question

A 5 molal solution of sodium carbonate in water having density 1.57g/ml.Find it's molarity. ​

Answer 1

Answer:

molarity = 7.831 molar

Explanation:

let the number of moles = n

   molality = (number of moles of solute) / weight of solvent in kg

   assumption: let the weight of solvent be 1kg    

   density of solution = 1.57g/ml = 1.57kg/Litre {1g/ml = 1kg/Litre}

   so 1 L solution weighs 1.57kg

   then volume occupied by 1 kg = 1÷1.57 =0.636L

       molality        =   n/1

             5             =    n

number of moles = 5

molarity = number of moles / volume

molarity = 5 / 0.636 = 7.831molar

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