SOLUTION: 1) How many cubic centimeters of water must be evaporated from 32 cubic centimeters of 4% solution of salt and water to make a solution that is 16% salt?
2) How much pure silver
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Question 1011699: 1) How many cubic centimeters of water must be evaporated from 32 cubic centimeters of 4% solution of salt and water to make a solution that is 16% salt?
2) How much pure silver must be added to 80 grams of fine silver (an alloy of 90% silver) to obtain a sterling silver (an alloy that is 92.5% silver)?
3) A solution of water and alcohol is 80% alcohol. How much alcohol must be added to 50 gallons of this solution to make it 90% alcohol?
Thanks in advance!
Found 3 solutions by josgarithmetic, addingup, ikleyn:
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
(1)
w, amount of volume to evaporate for removal;
Amount of salt stays the same but amount of solution becomes less as result of removal of some w water.
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(2) and (3), learn this:Two part mixture, one material quantity known, the other unknown
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
Let's call the final number of gallons x. So we want x number of gallons at 90%, we want .90x. And we have 50 gallon at 80%, we have .8*50. Lastly there is the amount we will add to the 50 gallon of 80% to make x gallon of 90%. This amount is 100% alcohol, so it is 1 and 1*x= x. And the quantity of it is x-50:
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.80*50+x-50= .9x
40+x-50= .9x
-10= -.1x Divide both sides by -.1:
x= 100 You have to add 100 gallon of pure alcohol to the 50 gal of 80% to get the solution to 90% concentration.
Answer by ikleyn(52779) (Show Source): You can put this solution on YOUR website!
.
For #1 see the lesson Mixture problems, Problem 2;
for #3 see the Problem 5 of the same lesson.
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