You are a work study student in our chemistry department. Amy, your supervisor has just asked you to prepare 250ml of 2.00M H2SO4 solution for tomorrow's undergraduate experiment. The Stock Solutions cabinet is under the Stockroom Explorer. You will find find a 2.50 liter bottle containing 17.8M H2SO4. Please prepare a flask containing 250ml of a 2.00M solution. To ensure proper credit, please write your calculations in the space given below.
mL1 x M1 = mL2 x M2
mL1 x 17.8 = 250 x 2.00M
Add some distilled H2O to the 250 mL volumetric flask, then pipet the value of mL1 of the 17.8M H2SO4 into the 250 mL flask adding concentrated H2SO4 cautiously. Add distilled H2O to the mark and mix thoroughly.
0.028 l
mL1 x M1 = mL2 x M2
mL1 x 17.8 = 250 x 2.00M
Add some distilled H2O to the 250 mL volumetric flask, then pipet the value of mL1 of the 17.8M H2SO4 into the 250 mL flask adding concentrated H2SO4 cautiously. Add distilled H2O to the mark and mix thoroughly.
Well, Amy, I'd love to help you out with that task! But before I give you my "serious" calculations, let me share a little joke with you. Why do chemists like nitrates so much?
Because they're cheaper than day rates!
Alright, now let's get serious and do some calculations:
To prepare a 250ml solution of 2.00M H2SO4, we'll need to use the formula:
M1V1 = M2V2
Where:
M1 = initial concentration of the stock solution (17.8M)
V1 = volume of stock solution to be taken
M2 = final concentration of the diluted solution (2.00M)
V2 = final volume of the diluted solution (250ml)
Plugging in the numbers, we get:
17.8M x V1 = 2.00M x 250ml
Now, let's solve for V1:
V1 = (2.00M x 250ml) / 17.8M
V1 ≈ 28.09ml
So Amy, you'll need to measure approximately 28.09ml of the stock solution and then dilute it with water to a final volume of 250ml. Make sure to wear goggles and gloves while handling the chemicals, and remember to clean up any spills – you don't want the undergrads to have a "blast"!
Hope this helps, and good luck with your experiment! If you need any more help or a well-timed joke, I'm here for you.
To prepare a 250 ml flask of a 2.00 M H2SO4 solution from the provided 17.8 M H2SO4 stock solution, we can use the dilution formula:
C1V1 = C2V2
Where:
C1 = concentration of the stock solution
V1 = volume of the stock solution to be taken
C2 = desired concentration of the final solution
V2 = final volume of the solution
In this case:
C1 = 17.8 M (concentration of the stock solution)
V1 = volume of the stock solution to be taken (unknown)
C2 = 2.00 M (desired concentration of the final solution)
V2 = 250 ml (final volume of the solution)
Rearranging the formula, we have:
V1 = (C2 * V2) / C1
Let's substitute the known values:
V1 = (2.00 M * 250 ml) / 17.8 M
V1 = (500 ml) / 17.8
V1 = 28.09 ml
Therefore, to prepare 250 ml of a 2.00 M H2SO4 solution, you need to take 28.09 ml of the 17.8 M H2SO4 stock solution and dilute it to a final volume of 250 ml with an appropriate solvent, such as water.