Answer:
0.07125 M
Step-by-step explanation:
Concept tested: Molarity
What is molarity?
- Molarity refers to the concentration of a solution in moles per liter.
How is molarity calculated?
- Molarity is calculated by dividing the number of moles by the volume of the solution.
- Molarity = Number of moles ÷ Volume
In this case, we are given;
- Mass of NaHCO₂ is 1.935 g
- Volume of the solution is 400 mL
We are required to calculate the molarity of NaHCO₂ solution;
We are going to use the following steps;
Step 1: Calculate the number of moles of NaHCO₂
Moles = Mass ÷ molar mass
Molar mass of NaHCO₂ = 68.0072 g/mol
Therefore;
Moles of NaHCO₂ = 1.935 g ÷ 68.0072 g/mol
= 0.0285 moles
Step 2: Calculate the molarity of NaHCO₂
We know that molarity = Moles ÷ Volume
Molarity = 0.0285 moles ÷ 0.4 L
= 0.07125 moles/Liter
= 0.07125 M
Thus, the molarity of the solution is 0.07125 M