How will you make a 200 mL solution of 1 mM
sucrose from a 0.1 M sucrose solution?
1. Mix 20 mL of the 100 mM sucrose and
180 mL of water.
2. Mix 50 mL of the 100 mM sucrose and
150 mL of water.
3. Mix 1 mL of the 100 mM sucrose and 199
mL of water.
4. Mix 10 mL of the 100 mM sucrose and
190 mL of water.
5. Mix 2 mL of the 100 mM sucrose and 198
mL of water.
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I suppose the answer is #5 but technically, none of the answers is correct.
0.1 M is 100 mM.
So take 2 mL of the 100 mM solution and dilute to a final volume of 200 mL. Hote that is NOT (repeat NOT) the same as 2 mL of the 100 mM solution and adding 198 mL water.
Thank you! Yes it was right
To make a 200 mL solution of 1 mM sucrose from a 0.1 M sucrose solution, you would need to choose option 3: Mix 1 mL of the 100 mM sucrose with 199 mL of water. This will give you a final concentration of 1 mM (millimolar) in a total volume of 200 mL.
To make a 200 mL solution of 1 mM sucrose from a 0.1 M sucrose solution, you need to dilute the 0.1 M sucrose solution with water.
Molarity (M) is the amount of solute (in moles) dissolved in a given volume of solvent (in liters).
First, let's convert the desired concentration of sucrose from mM to M.
1 mM is equal to 0.001 M.
Now, let's calculate the amount of sucrose you need to achieve a concentration of 0.001 M in a final volume of 200 mL (0.2 L):
moles of sucrose = Molarity × Volume (in liters)
moles of sucrose = 0.001 M × 0.2 L
moles of sucrose = 0.0002 mol
Since the 0.1 M sucrose solution is more concentrated, you will need to dilute it by adding water.
To calculate the amount of the 0.1 M sucrose solution you need to mix with water, you can use the dilution formula:
C1V1 = C2V2
where:
C1 = initial concentration (0.1 M)
V1 = initial volume (unknown)
C2 = final concentration (0.001 M)
V2 = final volume (0.2 L)
Plugging in the values:
0.1 M × V1 = 0.001 M × 0.2 L
V1 = (0.001 M × 0.2 L) / 0.1 M
V1 = 0.002 L
Convert 0.002 L to mL:
V1 = 0.002 L × 1000 mL/L
V1 = 2 mL
So, to make a 200 mL solution of 1 mM sucrose from a 0.1 M sucrose solution, you need to mix 2 mL of the 0.1 M sucrose solution with 198 mL of water.
Therefore, the correct option is:
Option 5: Mix 2 mL of the 100 mM sucrose and 198 mL of water.