Question

3pt) You are given a 2M glucose stock and you are asked to make 300ml of a 2% glucose solution using that stock. How much of the 2M glucose stock will you need to make 100 ml of a 2% glucose solution? The formula weight for glucose is 180.16. Be sure to clearly show all your calculations and to show the units of components through the calculation process

Please show steps

Answer 1

2% glucose solution means 2 gram of glucose in 100ml water.

Molarity = mass /molecular mass * 1000/ volume in ml.

Molarity of 2% glucose =

M = 2/180.16 * 1000/100 = 0.111M or 111 mM

So molarity of 2% glucose is 0.111M.

C1V1 = C2V2

C1 = concentration of stock solution

V1= volume of stock solution

C2= concentration of the working solution

V2= volume of working solution

C1 = 2M

V1= Need to find out

C2 = 0.111 M

V2 = 300 ml

2M * V1 = 300ml * 0.111M

V = 300 ml * .0111M / 2M = 16.65 ml

So we need 16.65 ml of 2M glucose and 283.35 ml of water to 300 ml of 2% glucose.

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