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

0.07125 M

Concept tested: Molarity

What is molarity?

How is molarity calculated?

In this case, we are given;

We are required to calculate the molarity of NaHCO₂ solution;

We are going to use the following steps;

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

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

the answer is 0.8m.

by: nicholas