You are a work study student in our chemistry department. Amy, your supervisor has just asked you to prepare 1000ml of 3.00M NaOH 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 19M NaOH. Please prepare a flask containing 1000ml of a 3.00M solution. To ensure proper credit, please write your calculations in the space given below.
you want to decrease the concentration by a factor of 3/19
So you need to increase its volume by a factor of 19/3
1L = 19/3 * 3/19 L
so you want to to take 3/19 L of the 19M NaOH and add water to get 1000mL
That is, add 842 mL of H2O to 158 mL of the 19M NaOH
With no exclusions listed I would take 157.9 mL of 19 M NaOH, add to a 1000 mL volumetric flask, then make to the mark with distilled water, stopper, mix thoroughly, label. Calculations:
mL1 x M1 = mL2 x M2
mL1 x 19M = 1000 mL x 3.00 M
mL1 = 1000 mL x 3.00 M/19 M = 157.9 mL
To prepare 1000ml of a 3.00M NaOH solution, we will use the formula:
M1V1 = M2V2
Where:
M1 = initial concentration of solution (19M)
V1 = initial volume of solution (unknown)
M2 = final concentration of solution (3.00M)
V2 = final volume of solution (1000ml)
Rearranging the formula, we can solve for V1:
V1 = (M2 * V2) / M1
Substituting the given values:
V1 = (3.00M * 1000ml) / 19M
V1 = 157.89ml (rounded to two decimal places)
Therefore, you need to measure 157.89ml of the 19M NaOH stock solution and dilute it with water to a final volume of 1000ml in a flask in order to obtain a 3.00M NaOH solution.
To prepare a 1000 ml of 3.00M NaOH solution using a 19M NaOH stock solution, you can follow these steps:
1. Determine the volume of the 19M NaOH stock solution needed. To calculate the volume, use the equation:
(M₁)(V₁) = (M₂)(V₂)
where M₁ and V₁ are the molarity and volume of the stock solution, and M₂ and V₂ are the desired molarity and volume of the final solution.
Plugging in the known values:
(19M)(V₁) = (3.00M)(1000ml)
2. Rearrange the equation to solve for the volume of the stock solution (V₁):
V₁ = (3.00M)(1000 ml) / (19M)
3. Calculate the volume:
V₁ ≈ 157.9 ml
Therefore, you need to measure approximately 157.9 ml of the 19M NaOH stock solution.
4. Once you have measured the required volume of the stock solution, transfer it to a flask or container.
5. Add distilled water to the flask until the total volume reaches 1000 ml. This will dilute the stock solution to the desired molarity of 3.00M NaOH.
By following these steps, you will be able to prepare a flask containing 1000 ml of a 3.00M NaOH solution using the provided stock solution.