Question

Watch the video that shows using the dilution method to make a solution of known concentration. Note that while the video shows the use of a beaker, in the lab we typically use a volumetric flask to make the diluted solution. The stock solution of KMnO4 has a concentration of 2.6 × 10-4 M. The pipette has a volume of 10.0 mL. What is the amount of KMnO4 delivered to the solution, in moles

Answer 1

`2.6* 10^(-6)\ moles`

Step-by-step explanation:

Considering:

`Molarity=(Moles\ of\ solute)/(Volume\ of\ the\ solution)`

Or,

`Moles =Molarity * {Volume\ of\ the\ solution}`

Given :

For potassium permanganate :

Molarity =
`2.6* 10^(-4)\ M`

Volume = 10.0 mL

The conversion of mL to L is shown below:

1 mL = 10⁻³ L

Thus, volume = 10.0×10⁻³ L

Thus, moles of potassium sulfate :

`Moles=2.6* 10^(-4) * {10.0* 10^(-3)}\ moles`

Moles of potassium permanganate =
`2.6* 10^(-6)\ moles`