Question

Experimental sucrose solution (final concentration) 30% 15% Amount of 30% stock sucrose solution needed 5 mL 2.5 mL 0.5 mL Amount of water needed O mL 2.5 mL 4.5 mL 3% 12. Make an additional 200 mL of 15% sucrose solution in Beaker 1 by mixing the 30% stock solution with water. Use the following dilution equation to solve for the necessary amount of stock solution MV, = M2V2 Where: • V1 = Needed volume of stock solution M = Sucrose concentration of stock solution = 30% • V2 = Desired volume of Beaker 1 solution = 200mL • M2 = Sucrose concentration of Beaker 1 solution = 15% After solving for V., figure out the how much water is needed to bring the total volume in Beaker 1 to 200mL. Record your calculated volume below. mL of water needed = mL of 30% stock sucrose solution needed = 1

Answer 1

M1V1=M2V2

M1= 30%

M2=15%

V1=?

V2= 200 mL

V1=M2V2/M1

= (15 $\times$ 200)/30

= 100 mL

mL of water needed= total volume-volume of the stock solution needed

= 200-100

= 100 mL

mL of 30% stock sucrose solution needed= 100 mL