I have 100mls of an antibiotic stock solution at a concentration of 6mg/ml. I would like a final volume of 10mls of the antibiotic at a concentration of 1.5mg/ml. How much of the stock solution do I need to obtain this?
When figuring concentrations and volumes from a question like this, it's important to first eliminate any information that is unnecessary in solving the problem to avoid confusion. The three pieces of important information in this question are the concentration of the stock solution (6mg/ml), the final concentration that you want to obtain (1.5mg/ml) and ...
A concentration/volume problem is explained.