An aqueous solution at 25 °C is 10.8% HNO3 by mass and has a density of...

Question

Question

An aqueous solution at 25 °C is 10.8% HNO3 by mass and has a density of 1.044 g/mL. What is the pH?

Answer 1

Answer #1

The solution is 10.8 % by mass which means 10.8 g of HNO3 is present in 100g of solution.

Thus 1000g of solution has 108 g of nitric acid

the solution has density of 1.044 g/mL

Volume of the solution = mass / density = 1000g/ 1.044g/mL= 957.85 mL

molar mass of HNO3 = 63 g/mL

MOlarity of solution = number of moles/ Volume in L

= [108/63]/ (957.85 /1000) = 1.789 M

pH is defined only for dilute solutions with molarity ranging from 1M(H+) acid to 1M base(OH-).

Thus pH is not defined for this solution.

Answer 2

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