[giggsy]

Given a 20% w/v solution of Chlorhexidine Gluconate, what volume is required to make the following solutions.

2 litres of a 0.2%

I did C1V1 = C2V2

So: 20V1= 0.2*2000

so v1= 0.2*2000/ ( 20) = 20ml.

However my friend says that the 0.2 has to be divided by 100 before you do anything. Help please!