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You need to make 1litter of 50% dextrose solution. The only dextrose solution you have in stoke is 70%. How much of the 70% solution so you need to add to sterile water to make 1 litter of 50% dextrose

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J.R. S. | Ph.D. in Biochemistry--University Professor--Chemistry TutorPh.D. in Biochemistry--University Profes...
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(X L)(70%) = (1 L)(50%)
x = 0.714 L
You need 714 ml of the 70% and enough water to make 1L