Question

A solution contains 20 g of sugar in 80 g of water. calculate the concentration of solution in terms of mass percent

Answer 1

Answer:

Mass % = Mass of the solute/ Mass of the solution × 100

= 20/ 20+80 ×100

= 20/100×100

= 20%

ANS-: The mass % of the solution is 20%.

Answer 2

The concentration of solution in terms of mass percentage is 20%.

Given,

Mass of sugar(solute)=20 g.

Mass of water(solvent)=80 g.

To find,

the concentration of solution in terms of mass percentage.

Solution:

• The concentration term here referred to is weight by weight percentage.
• Weight by weight percentage of a substance in a mixture or a solution is defined as the mass of that substance in 100 g of solution or mixture.
• Weight by weight percentage of a substance is temperature independent.
• Weight by weight percentage is also referred as mass by mass percentage.
• It is calculated as:                          
• %w/w=(Mass of the substance/Mass of the mixture or solution) x 100.

• Mass of the solution=Mass of solvent+Mass of solute.

Mass of the solution=Mass of sugar+Mass of water

Mass of the solution=(20+80) g

Mass of the solution=100 g.

%w/w=(Mass of the substance/Mass of the mixture or solution) x 100

The weight by weight percentage of the solution will be,

$=\frac{20}{100} X100\\=20 percent.$

Hence, the weight percentage is 20%.

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