# 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}

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Chapter 8 / Lesson 5Learn 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.