Question

a solution contain 40g of common salt in 320g of solution taking the density 2g per cubic cm..find the mass by volume percentage of the solution​

Answer 1

Given:

✭ Mass of salt (solute) = 40 g

✭ Mass of solution = 320 g

✭ Density = 2g/m³

To Find:

◈ Mass by volume percentage of solution?

Solution:

Concept

So here we may first find the Volume of the solution. Later on we shall find the mass/volume % simply by substituting the values to get our final answer which is 2.5 × 10⁻⁵%

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First we have to find the volume of the solution

»» Density = Mass/Volume

»» Volume = Mass/Density

• Mass = 320 g
• Density = 2 g/m³

»» Volume = 320/2

»» Volume = 160 m ³

Now we shall convet the volume to ml,

➝ 1 m³ = 1000000 ml

➝ 160 m³ = 160 × 1000000

➝ Volume = 160000000 ml

Now the mass by volume% is given by,

Mass by volume % = Mass of solute in g/Volume of solution in ml × 100

• Mass of solute = 40 g
• Volume of solution = 160000000

➳ Mass by volume % = {40/160000000} × 100

➳ Mass by volume % = 40/1600000

➳ Mass by volume % = 2.5 × 10⁻⁵%

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