Question

A teacher asks a student to dissolve 2.5 g of sodium carbonate in 50 g of water. What will be the concentration of the prepared solution?

A. 4.76%
B. 5.00%
C. 47.6%
D. 95.2%

Answer 1

Answer:

B is the correct answer

Answer 2

Given:-

→ Mass of Sodium Carbonate

dissolved = 2.5g

→ Mass of water = 50g

To find:-

→ Concentration of the solution

Solution:-

Here, Sodium Carbonate is solute and water is solvent. We are given with masses of solute and solvent. So firstly, let's calculate the total mass of the solution.

Mass of solution:-

= Mass of solute + Mass of solvent

= ( 2.5 + 50 )g

= 52.5g

Hence, mass of solution is 52.5g .

Now, let's calculate the concentration of the solution.

Concentration of a solution [m/m%] :-

= Mass of solute/Mass of solution × 100

= 2.5/52.5 × 100

= 250/52.5

= 4.76%

Thus, concentration of the solution

is 4.76% [Option.A]