Hi Gul Kesh you can use this formula:

((V1 x C1) + (V2 x C2)) / (V1 + V2)

Where V = volume and C = concentration.

To calculate the final concentration of the mixture of essential oils A and B, you need to relate the total amount of active substance in both oils to the total volume of the mixture.

Here are the steps for the calculation:

Calculating the total amount of active ingredient in each oil:

Oil A: 5 ml * 100 mcg/ml = 500 mcg

Oil B: 5 ml * 100 mcg/ml = 500 mcg

Addition of the quantities of the active substances:

Total amount = 500 mcg (from oil A) + 500 mcg (from oil B) = 1000 mcg

Determination of the total volume of the mixture:

Total volume = 5 ml (oil A) + 5 ml (oil B) = 10 ml

Calculate the final concentration:

Final concentration = total amount of active substance / total volume

Final concentration = 1000 mcg / 10 ml = 100 mcg/ml

The final concentration of the mixture is therefore 100 mcg/ml.

Thank you for your answers!