1.935 of nahco2 is dissolved in water to make 400ml of solution molarity

0.07125 M

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