Question

describe quantitatively and qualitatively how you would prepare 1000. mL of a 2.00 M solution of nitric acid from a 18.0 M H2SO4 stock solution

Answer 1

Ans. A stock solution of H₂SO₄ can only be used to prepare a diluted solution of H₂SO₄ but HNO₃. Similarly, a stock solution of HNO₃ can only be used to prepare a diluted solution of HNO₃ but not H₂SO_4.

# It’s assumed that the given stock solution is of HNO₃ and we need to prepare its diluted solution.

# Now, using M1V1 (stock soln.) = M2V2 (Diluted soln.)

            Or, V1 = M2V2/M1 = (2.00 M x 1000.0 mL) / 18.0 M = 111.11 mL

Hence, required volume of stock soln. = 111.11 mL

# Preparation: Take small volume of distilled water (around 200-300 mL) in a 1000-mL standard volumetric flask. Pre cool it by keeping it in an ice-water bath. Gradually transfer 111.11 mL of 18.0 M HNO₃ solution in small volumes at a time using a glass pipette, and mix the solution after every addition. Add distilled water to bring the volume near the neck but around 5.0 mL below the calibration mark. Allow the solution to attain room temperature overnight. Make the final volume up to the mark with distilled water. Plug the cap and mix well by inverting several times. The resultant solution is your desired solution.