a solution of glucose in water is labelled as 10% w/w.what would be the molarity of the solution
Answer (1)
11th Feb, 2021
Dear student,
Your question is actually incomplete. Because you have not mentioned the density of solution. Without density of solution the molarity cannot be founded. So I am assuming the density of solution as 1.2gm/ml
10% w/w of glucose means 10 gm of solute ( glucose ) present in 100 gm of solution ( glucose + water ).
Glucose = C6H12O6 ( MM = 180 ).
So, volume of solution = 100/1.2 = 83.33 ml
Now, molarity is number of moles of solute present in 1000 ml of solution.
So, moles of solute ( Glucose ) = 10/180 = 1/18mol.
So, 1/18 mol of glucose is present in 83.33 ml of solution.
So, for 1000 ml of solution the miles of solute will be = 1×1000/18×83.33 {via unitary method }
So, the molarity will be = 0.667 M
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