Percentage of Water and Solids in a Sample of Milk (Leaving Cert Agricultural Science): Flashcards

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Percentage of Water and Solids in a Sample of Milk
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Purpose of milk water/solids experiment

Calculate exact % of water & solids via evaporation

Equipment for precise mass measurement in milk expt

Electronic balance

Formula for % water in milk

Weight of waterWeight of milk×100\frac{\text{Weight of water}}{\text{Weight of milk}} \times 100

Formula for % solids in milk

Weight of solidsWeight of milk×100\frac{\text{Weight of solids}}{\text{Weight of milk}} \times 100

What must water % + solids % equal?

100%

Typical water % in cow's milk

87-88%

Typical solids % in cow's milk

12-13%

Components of milk solid fraction

Proteins, fats, lactose, minerals

Tool for handling hot equipment safely

Tongs

How to know water evaporation is complete?

No steam produced & material appears dry

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