posted by John .
How would you prepare the following solution? a)2% NaCL(w/v) b).35M glucose
For b I got glucose 0.35=wt/180=63gm/L, but not sure if I'm doing it right.
2% w/v means 2g NaCl/100 ml solution.
Add 2 g NaCl to a vessel and add enough water to make 100 mL.
b. 63 g glucose/L solution is right IF you do it right. You place 63 g glucose in a 1 L volumetric flask, add some water, swirl until all of the glucose is dissolved, then add water to the mark on the volumetric flask. This makes a total of 1,000 mL (1 L) OF SOLUTION. Note what I did NOT say. You do NOT add 63 g glucose to 1000 mL H2O. WHY? Because doing that gives you more than 1000 mL of solution.
CaCl2 is done the same way as glucose.