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

 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 correctsupposed 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=.70xX={25×1000/70) =357.1mlSo 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 687.5mL70% - 25% = 55 parts sterile water0% - 25% = 25 parts 70% solutiontotal volume 80 parts 1000mL55/80 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 H2O358 ml Dextrose 70%