1. A chemist conducted a recrystallization on 18.5 g of a solid and collected 11.2 g as a first crop. She re-cooled the mother liquor and obtained 2.1 g as a second crop. Show your calculation when answering the following questions:
(a) What is the percent recovery for the first crop? (1.5 marks)
What is the total percent recovery?
what is 11.2/18.5 ?
what is 13.3/18.5?
To calculate the percent recovery for the first crop, we can use the formula:
Percent Recovery = (Amount of first crop collected / Amount of solid used initially) * 100
Given:
Amount of first crop collected = 11.2 g
Amount of solid used initially = 18.5 g
Using the formula, we can calculate the percent recovery for the first crop:
Percent Recovery = (11.2 g / 18.5 g) * 100
Percent Recovery = 60.54%
To calculate the total percent recovery, we need to consider both the first and second crops.
Total Percent Recovery = (Total amount collected / Amount of solid used initially) * 100
Given:
Total amount collected = Amount of first crop collected + Amount of second crop collected
Total amount collected = 11.2 g + 2.1 g = 13.3 g
Amount of solid used initially = 18.5 g
Using the formula, we can calculate the total percent recovery:
Total Percent Recovery = (13.3 g / 18.5 g) * 100
Total Percent Recovery = 71.89%
To calculate the percent recovery for the first crop, you can use the formula:
Percent Recovery = (Mass of First Crop / Mass of Original Sample) * 100
Given data:
Mass of First Crop = 11.2 g
Mass of Original Sample = 18.5 g
Using the formula, we have:
Percent Recovery = (11.2 g / 18.5 g) * 100
Calculating this value, we get:
Percent Recovery = 60.54%
Now, let's calculate the total percent recovery.
To calculate the total percent recovery, we need to consider both the first crop and the second crop.
Total Percent Recovery = (Mass of First Crop + Mass of Second Crop) / Mass of Original Sample * 100
Given data:
Mass of Second Crop = 2.1 g
Mass of Original Sample = 18.5 g
Using the formula, we have:
Total Percent Recovery = (11.2 g + 2.1 g) / 18.5 g * 100
Calculating this value, we get:
Total Percent Recovery = 77.84%