How many milliliters of a stock solution of 2.00 M KNO3 would you need to prepare 250 mL of 0.150 M KNO3? Please show work.
To find the volume of the stock solution needed to prepare a given volume and concentration of a solution, we can use the formula:
C1V1 = C2V2
where C1 and V1 are the concentration and volume of the stock solution, and C2 and V2 are the concentration and volume of the desired solution.
Let's plug in the values from the question:
C1 = 2.00 M (concentration of the stock solution)
V1 = ? (unknown volume of the stock solution)
C2 = 0.150 M (concentration of the desired solution)
V2 = 250 mL (volume of the desired solution)
Using the formula, we can rearrange it to solve for V1:
V1 = (C2 * V2) / C1
Plugging in the values, we get:
V1 = (0.150 M * 250 mL) / 2.00 M
Simplifying the equation, we have:
V1 = (0.0375 mol/L * 0.250 L) / 2.00 mol/L
V1 = 0.009375 moles / 2.00 mol/L
Finally, we can calculate the volume:
V1 = 0.00469 L * 1000 mL/L
V1 ≈ 4.69 mL
Therefore, you would need approximately 4.69 mL of the 2.00 M KNO3 stock solution to prepare 250 mL of 0.150 M KNO3 solution.
To determine the volume of the stock solution needed to prepare the desired solution, we can use the formula:
C1V1 = C2V2
Where:
C1 = concentration of the stock solution
V1 = volume of the stock solution
C2 = concentration of the desired solution
V2 = volume of the desired solution
We are given the following information:
C1 = 2.00 M
V1 = unknown
C2 = 0.150 M
V2 = 250 mL
Plugging these values into the formula:
(2.00 M)(V1) = (0.150 M)(250 mL)
Now we can solve for V1:
(2.00 M)(V1) = (0.150 M)(250 mL)
V1 = (0.150 M)(250 mL) / (2.00 M)
V1 = 18.75 mL
Therefore, you would need 18.75 mL of the stock solution to prepare 250 mL of 0.150 M KNO3.
You want to dilute it 2M/.150= 13 1/3 times. So you want one part stock solution, the remainder water.
1part= 250/(13.3333)=18.75ml 2M stock solution.
fill up the remainder with water, stir and label. (remainder= 12.33333x18.75, but there is no need to measure it, just fill to the 250ml mark).
check my thinking.