Stock Standard (mother): Methyl Orange 0.1000 g/L = 100 mg/L. How to find concentration of sample...

Question:

Stock Standard (mother): Methyl Orange 0.1000 g/L = 100 mg/L.

How to find concentration of sample when taken 5 mL of the mother solution and diluting it up to 100 mL with distilled water?

Dilution:

The technique used to decrease the concentration of a solution by adding a solvent into it is called dilution. The usual way of diluting solutions is by taking a certain amount of the concentrated solution and diluting the solution to a specific volume such that the desired concentration will be made.

Answer and Explanation: 1


The equation to be used is:

{eq}\rm C1V1 = C2V2 {/eq}

where:

  • C1 - initial concentration (100 mg/L)
  • V1 - volume of the initial concentration (5 mL)
  • C2 - final concentration (unknown)
  • V2 - volume of the final concentration (100 mL)


These values will be plugged into the equation and will be evaluated to calculate the final concentration of the solution.

{eq}\rm 100\ mg/L \times 5\ mL = C2 \times 100 mL\\ C2 = \dfrac{100\ mg/L \times 5\ mL}{100\ mL} = \boxed{\mathbf{5\ mg/L}} {/eq}


Learn more about this topic:

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Calculating Dilution of Solutions

from

Chapter 8 / Lesson 5
69K

Learn what a solution is and how to properly dilute a new solution from a stock solution. Learn the dilution equation that combines molarity, the volume of stock solution and desired solution to determine how much stock solution is needed for the new solution.


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