1) You prepare a stock solution (highly concentrated) of sugar water with a conc
ID: 3199506 • Letter: 1
Question
1) You prepare a stock solution (highly concentrated) of sugar water with a concentration of 500 mg/ml. You need to make a new solution that is half as concentrated and has a final volume of 100 ml.
Step one: Identify the concentration of your new solution: ____.
Step two: Identify how much volume of the stock solution you need AND how much water you need to make 100 ml of this new solution. Show your work. _________ of the stock solution _________ of water
2. Make a second, new solution that is 1/10 the concentration of the stock solution and that has a final volume of 100 ml. Show your work.
Explanation / Answer
step 1)
concentration is half of original = 500/2 = 250 mg/ml
step 2) final volume required = 100 ml
total sugar concentration required = 250*100 = 25000
since the original concentrate has sugar, and the water we add will have no sugar,
original concentrate to be added = concentration required/original concentrate = 25000/500 = 50 ml
hence to make 100 ml concentrate we need 50 ml stock solution and 50 ml water
2.
1/10 concentrate = 500/10 = 50 mg/ml
for 100 ml solution total concentrate required = 50*100 = 5000 mg
original concentrate to be added = concentration required/original concentrate = 5000/500 = 10 ml
hence 10 ml stock solution
rest 90 ml water to make 100 ml of solution with 1/10 concentration
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.