How much water is needed?

Question

How much water is needed to dilute 25 cc of 15% gulcose to 5%?

Answer 1

Dilution formula: C1V1 = C2V2

where "C" is any unit of concentration as long as C1 and C2 are the same unit

where "V" is any unit of volume as long as V1 and V2 are the same unit.

First calculate the final volume (V2) if C1 is 15, V1 is 25 cc and C2 is 5.

Since that is the final volume subtract the original 25 cc to get the volume of water you need to use to reach the final volume.

You should find your final volume will be 75 cc so you must add 50 cc of water to the 25 cc of 15% to get the final volume of 75cc.

Answer 2

50 cc is the answer.15%=25cc.Hence,5%=? It will be,25*15/5=75. But you aready have 25 cc with you. Hence,the dilution required will be 75-25=50. Thus 50 cc is the answer. As the % will be 1/3 the dilution required will be 3/1 i.e.3.