Molality And Molarity

The density of the nitric acid solution is given as 1.5 g/mL, with a weight percentage of 68% HNO $_3$ . Our task is to find the molar concentration in mol/L.

First, calculate the mass of HNO $_3$ in 1 L (1000 mL) of solution:

$%5Ctext%7BMass%20of%20solution%7D%20%3D%20%5Ctext%7Bdensity%7D%20%5Ctimes%20%5Ctext%7Bvolume%7D%20%3D%201.5%20%5C%2C%20%5Ctext%7Bg%2FmL%7D%20%5Ctimes%201000%20%5C%2C%20%5Ctext%7BmL%7D%20%3D%201500%20%5C%2C%20%5Ctext%7Bg%7D$

$%5Ctext%7BMass%20of%20HNO%7D_3%20%3D%200.68%20%5Ctimes%201500%20%5C%2C%20%5Ctext%7Bg%7D%20%3D%201020%20%5C%2C%20%5Ctext%7Bg%7D$

Given: Molar mass of HNO $_3$ :

$%5Ctext%7BMolar%20mass%20of%20HNO%7D_3%20%3D%20(1%20%5Ctimes%201)%20%2B%20(1%20%5Ctimes%2014)%20%2B%20(3%20%5Ctimes%2016)%20%3D%2063%20%5C%2C%20%5Ctext%7Bg%2Fmol%7D$

Calculate the number of moles of HNO $_3$ :

$%5Ctext%7BMoles%20of%20HNO%7D_3%20%3D%20%5Cfrac%7B1020%20%5C%2C%20%5Ctext%7Bg%7D%7D%7B63%20%5C%2C%20%5Ctext%7Bg%2Fmol%7D%7D%20%3D%2016.190%20%5C%2C%20%5Ctext%7Bmol%7D$

Calculate the concentration in mol/L:

$%5Ctext%7BConcentration%7D%20%3D%20%5Cfrac%7B%5Ctext%7BMoles%20of%20HNO%7D_3%7D%7B%5Ctext%7BVolume%20in%20L%7D%7D%20%3D%20%5Cfrac%7B16.190%20%5C%2C%20%5Ctext%7Bmol%7D%7D%7B1%20%5C%2C%20%5Ctext%7BL%7D%7D%20%5Capprox%2016.2%20%5C%2C%20%5Ctext%7Bmol%2FL%7D$

Thus, the approximate concentration of nitric acid is $16.2%20%5C%2C%20%5Ctext%7Bmol%2FL%7D$ .

High-Yield Trend

Chapter Questions
2 MCQs

Official Solution

Official Solution

Molality And Molarity

High-Yield Trend

Chapter Questions 2 MCQs

Official Solution

Official Solution

Chapter Questions
2 MCQs