Question

Prepare 500mL of a 4% solution by diluting a 20% solution with water. What is the volume of drug and volume of diluent?

Answer 1

500 ML SOLUTION OF 4% MEANS = 4 GRAMS IN 100 ML SOLUTION

THAT IS = 4gms of solute/ 100ml of solution

• AMOUNT OF SOLUTE NEEDED TO MAKE 500ML OF SOLUTION

4gms OF SOLUTION IN 100 ML IS EQUALS TO ' X' GRAMS IN 500ML THAT IS =

4gms/100ml= Xgms/500ml (CROSS MULTIPLY)

WE GETS Xgms= 500*4/100

=20gms OF SOLUTE

• THE VOLUME OF DRUG USED TO MAKE 500ML OF 4% SOLUTION FROM 20% SOLUTION

   = 20% MEANS 20gms IN 100ML SOLUTION

= 20gms IN 100ML SOLUTION IS EQUALS TO 20gms OF VOLUME OF DRUG ' Y' ml

​​​​​​​   =20gms/100ml= 20gms/ 'Y ' ml ( CROSS MULTIPLY)

VOLUME DRUG IN SOLUTION= Y= 100 * 20 /20

= 100ML   

VOLUME OF DILUTENT IN SOLUTION IN 500 ML SOLUTION = 400ML

  

1. VOLUME OF DRUG IN SOLUTION = 100ML

2.   VOLUME OF DILUTENT IN SOLUTION = 400ML