A student placed 18.5 g of glucose (c6h12o6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-ml mark on the neck of the flask was reached. the flask was then shaken until the solution was uniform. a 45.0-ml sample of this glucose solution was diluted to 0.500 l. how many grams of glucose are in 100. ml of the final solution?

Question

Isiah Meadows

Chemistry

14 March, 14:34

A student placed 18.5 g of glucose (c6h12o6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-ml mark on the neck of the flask was reached. the flask was then shaken until the solution was uniform. a 45.0-ml sample of this glucose solution was diluted to 0.500 l. how many grams of glucose are in 100. ml of the final solution?

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Answers (1)

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Alia Bentley · Answer 1

100ml = 0,1L

Concentration of glucose = mass / volume

Concentration=18,5 / 0,100

= 185 g/L

We take away, 0,045 L of that solution, creating another solution with it but with 0,500 L of volume

Concentration of the first solution = C1

Volume of the first solution = V1

Concentration of the second solution = C2

Volume of the second solution = V2

C1xV1 = C2xV2

185 x 0,045 = C2 x 0,500

= 16,65 g/L - - > this is the concentration of the new solution

The only thing left is to know the mass in 0,100 L

Concentration = mass / volume

16,65 = mass/0,100

=1,665 grams