Question

How would you prepare 250 mL of a 10% (w/v) KCl solution? (KCl=74.6 g/mol)

Answer 1

10% (w/v) KCl solution=0.10= x g of KCl/250mL

Solving for x g of KCl:

x g of KCl=0.10*250ml=25g of KCl


Add to 250mL to flask and make to volume.