Question

(a) Rohan added 30 grams of milk in 120 grams of water. Calculate the concentration in
terms of mass by mass percentage of the mixture.
b) Write one property of this mixture.

Answer 1

Given info : Rohan added 30 grams of milk in 120 grams of water.

To find : the concentration in the term of mass by mass percentage of the mixture.

Also write one property of this Mixture.

Solution : concentration of milk (w/w %) = mass of milk/mass of solution × 100

= 30g/(120g + 30g) × 100

= 30/150 × 100

= 20 %

Therefore 20% of milk is present in the solution by mass.

Milk and water is a colloidal solution. So sometimes, mixture of milk and water seems as homogeneous but sometimes it seems as heterogeneous.

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Answer 2

Explanation:

Given Info:

Rohan added 30 grams of milk in 120 grams of water.

Therefore, Solute is milk=30 grams.

Solvent is water=120 grams.

And solution =Solute+Solvent =30+120=150 grams.

To find:

a) Mass by mass percentage of the mixture.

b) Write one property of this mixture.

Solution:

mass of solute/mass of solution ×100

30/150×100=20%.

Hence milk is present in 20% by mass.

It has the property to show tyndall effect as the particles size of a colloidal solution is between 1<100 nm.