To estimate the percentages of water and solids in a sample of milk:
1 - Leaving Cert Agricultural Science - Question 4(b) - 2019
Question 4(b)
To estimate the percentages of water and solids in a sample of milk:
1. Use a clean container and record its mass.
2. Add the milk sample to the container and deter... show full transcript
Worked Solution & Example Answer:To estimate the percentages of water and solids in a sample of milk:
1 - Leaving Cert Agricultural Science - Question 4(b) - 2019
Step 1
Mass of clean container
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Use a clean container and record its mass.
Step 2
Add milk sample
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Add the milk sample to the container and determine the total mass of the container with the milk.
Step 3
Dry in oven or hotplate
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Heat the sample in an oven or on a hotplate until it dries completely, typically at 100°C, and allow it to reach constant mass by reweighing.
Step 4
Find loss of mass
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Calculate the loss of mass. This loss represents the mass of water present in the milk.
Step 5
Remaining mass
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The remaining mass after drying corresponds to the mass of solids in the milk.
Step 6
Percentage calculation
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Calculate the percentages as follows:
Percentage of water = (mass of water / total mass of milk) × 100%
Percentage of solids = (mass of solids / total mass of milk) × 100%
Join the Leaving Cert students using SimpleStudy...
