Calculate the percentage recovery after recrystallization? ?

To calculate the percentage recovery after recrystallization, you need to know the initial amount of the compound before recrystallization and the final amount of the purified compound after recrystallization.

The formula to calculate the percentage recovery is:

Percentage Recovery = (Final amount / Initial amount) x 100

For example, if you started with 10 grams of a compound and after recrystallization you obtained 8 grams of purified compound, the percentage recovery would be:

Percentage Recovery = (8 / 10) x 100 = 80%

So, the percentage recovery after recrystallization in this example would be 80%.

Steps to Calculate Percentage Recovery after Recrystallization:

1. Obtain Mass of Initial Impure Substance: Weigh the crude sample before recrystallization to determine the initial mass (m_i).

2. Obtain Mass of Recrystallized Product: After filtering and drying, weigh the recrystallized product to determine the final mass (m_f).

3. Calculate Percentage Recovery:

```
Percentage Recovery = (m_f / m_i) x 100
```

Example:

If an initial impure sample with a mass of 10.0 g yields 7.5 g of recrystallized product, then the percentage recovery is calculated as follows:

```
Percentage Recovery = (7.5 g / 10.0 g) x 100 = 75%
```

Therefore, the percentage recovery after recrystallization in this example is 75%.