If given 290ml of a diluted glucose solution 0.75% (w/v) that was made by adding 30mL...
If given 290ml of a diluted glucose solution 0.75% (w/v) that was made by adding 30mL of a stock glucose solution and 260mL of water, what was the original concentration of the stock glucose solution expressed as grams/100mL or % (w/v)?
Homework Answers
Given,
260(Water)ml+30ml(glucose
stocked=solution(ml)+solvent(g))=290ml(Total
Solution)
According to given w/v(Weight in grams/Total solution
volume)=0.75 for 290ml
w/290=0.75%=0.75/100
=>w=0.75x290/100=217.5/100
w=2.17g/ml
Weight of glucose in 290ml solution = weight of glucose in
30ml(Because of no added glucose for any of the solutions)
Since we have w=2.17g/100ml(Glucose weight for
290ml & 30ml remains same) apply formula for 30ml
%=2.17(w)*100/30(v)=7.25%
Please observe the colouring, so you may not have any doubts
further in using formula.
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