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Pharmacy Math Alligation

by Sarah
(MS)

If a physician orders 25% dextrose,1000ml and all you have is 70% dextrose 1000 ml,how much 70% dextrose and how much sterile will be used ?

Comments for Pharmacy Math Alligation

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Alligation
by: Anonymous

By alligation method. 70-25=45',for water0-25 =25" 1000*45/170=642.....1000*25/70=358
corrections
by: Anonymous

1000*45/170=642.....1000*25/70=358 this is not correct

supposed to be

1000*45/70=642.....1000*25/70=358

( typed 170 instead of 70 )
which is correct answer?
by: Anonymous

so which one is correct answer-642 or 358?

what is 0-25=25. How did we come up with that?
correct answer
by: Anonymous

642
Answer
by: Anonymous

C1v1=c2v2
.25×1000=.70x
X={25×1000/70)
=357.1ml
So we need 357.1 ml of 70% to make 1000ml of 25%
So 1000-357.1=642.9ml
Alligation
by: Anonymous

HOW DID YOU GET : "of 1ML and 9 ML" ?
here you go
by: Toman

687.5mL

70% - 25% = 55 parts sterile water

0% - 25% = 25 parts 70% solution

total volume 80 parts 1000mL

55/80 x 1000 = 687.5mL sterile water
do the math
by: Anonymous

70-25=45
right?
easy
by: ya

25/70 x1000=358 mL sol dextrose 70%
we need 1000 ml ,so 1000-358=642 water add to 357 ml of 70% sol dextrose.
642 ml H2O
358 ml Dextrose 70%

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