Question

A sample of concentrated nitric acid is 63% w/w. If the density of the sol. Is 1.15gml-1. what is the molarity of the acid?

Answer 1

Use molarity formula which is number of moles divided by volume of solution

Here 63 g of nitric acid dissolved in 100 g of water

You have to calculate the volume by formula density = mass / volume

Answer 2

Answer: molarity = 11.5

Explanation:

Given: Sample of concentrated nitric acid = 63% w/w

Density = 1.15gml-1

To find = molarity of acid

∴ Use the volume of the solution divided by the number of moles in the formula for molarity.

Here, 100 g of water was used to dissolve 63 g of nitric acid.

molarity = number of moles of solute/volume of solution in litres

100grams solution- 63gHNO3

Density= mass/volume

volume  = mass/density

              = 100g/1.15gml

              =10000/115 ml

molarity = 63/63/10000/115*1/1000

molarity =  11.5

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