A chemistry graduate student is given 500.mL of a 0.40M chlorous acid HClO2 solution. Chlorous acid is a weak acid with =Ka×1.110−2. What mass of NaClO2 should the student dissolve in the HClO2 solution to turn it into a buffer with pH =2.11?

Answer : The  mass of should be, 23.5 grams.

Explanation : Given,

Concentration of = 0.40 M

Volume of solution = 500 mL = 0.5 L

pH = 2.11

First we have to calculate the value of .

The expression used for the calculation of is,

Now put the value of in this expression, we get:

Now we have to calculate the concentration of

Using Henderson Hesselbach equation :

Now put all the given values in this expression, we get:

Now we have to calculate the moles of

Now we have to calculate the mass of

Molar mass of = 90.44 g/mol

Therefore, the mass of should be, 23.5 grams.

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

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