## How do you multiply dilutions?

This method is called multiplying by the inverse (of the dilution factor).

- If the dilution factor is in the form of a fraction, “flip” the fraction. (i.e., 1/50 becomes multiply by 50/1).
- If the dilution factor is in decimal form, multiply by 1 over the decimal. (i.e., 0.02 becomes multiply by 1/0.02).

**How do you calculate time dilution?**

Multiply the final desired volume by the dilution factor to determine the needed volume of the stock solution. In our example, 30 mL x 1 ÷ 20 = 1.5 mL of stock solution. Subtract this figure from the final desired volume to calculate the volume of diluent required–for example, 30 mL – 1.5 mL = 28.5 mL.

### How do you dilute 2 times?

Dilution by Adding Solvent to an End Volume: Consider the case of the alcohol above. Since 50mL of the alcohol was diluted to a final volume of 100mL, we say the alcohol was diluted “two times,” “twice,” or “2x.” For the acid, 20mL was diluted to 500mL, so it would be described as being diluted 25 times (500/20 = 25).

**What does it mean to dilute 10 times?**

The idea here is that in a 10 -fold dilution, the volume of the diluted solution is 10 times higher than the volume of the stock solution. This is equivalent to saying that the concentration of the stock solution is 10 times lower than the concentration of the diluted solution.

#### What is a 1 to 100 dilution?

For a 1:100 dilution, one part of the solution is mixed with 99 parts new solvent. Mixing 100 µL of a stock solution with 900 µL of water makes a 1:10 dilution. The final volume of the diluted sample is 1000 µL (1 mL), and the concentration is 1/10 that of the original solution.

**What is a 1% dilution?**

A 1:1 dilution would then mean mix 1 part “X” with 0 parts diluent to make 1 part total – not a dilution at all!

## What is a 1 in 50 dilution?

Explanation: If you want to make a 1/50 dilution you add 1 volume part of the one to 49 parts of the other, to make up 50 parts in all.