Question

How would you prepare a solution of 0.15M of glucose in water

Answer 1

All depends of what volume of solution you want to prepare. Lets say, for example, you want a volume of 50 mL.

For a volume of 50 mL, you'll need the following moles of glucose:

50mL = 0.05 L

0.15M = 0.15 mol/L * 0.05 L = 0.0075 moles of glucose

This, in grams:

0.0075 moles of glucose * (180 g/mol) = 1.35 grams.

Another form of preparing the solution is by dilution, having a solution of certain concentration of glucose, and adding water to it to make it 0.15 M. For example, if we have a 0.5 M solution of glucose and we want 50 mL of 0.15 M:

V₁C₁ = V₂C₂

0.5M * V₁ = 0.15M * 50ml

V₁ = 15 mL