Question

SS!! 3. How would you make up exactly 400 ml of a 0.20 molar sucrose solution at room temperature? # moles solyte 20M = I solution

Answer 1

sucrose Molar mass: 342.3 g/mol For 1 M solution of sucrose; 342.3 g sucrose is dissoled 1 liter of water devide mole and gram of sucrose to obtain 0.2M 1 M/5 = 0.2M, 342.3/5 = 68.46 So for 0.20 M solution of sucrose; 68.46 g of sucrose is dissolved in 1 liter of water there fore 68.46 g sucrose in 1000 ml SO X g sucrose in 400 ml 68.46 g x 400 ml = Xgx 1000 ml (cross multiplication) (68.46 g x 400 ml) / 1000 ml = X g 27384 / 1000 = Xg 27.384 g = Xg Hence to make 0.2 M solution of sucrose; 27.384 g sucrose is required and dissovle up to 400 ml water