Asolution of hcooh has 0.22m hcooh at equilibrium. the ka for hcooh is 1.8×10−4. what is the ph of this solution at equilibrium?

Answer : The pH of the solution is, 2.21

Solution :  Given,

Concentration (c) = 0.22 M

Acid dissociation constant =

The equilibrium reaction for dissociation of (weak acid) is,

initially conc.         c                       0         0

At eqm.                                      

First we have to calculate the concentration of value of dissociation constant .

Formula used :

Now put all the given values in this formula ,we get the value of dissociation constant .

By solving the terms, we get

Now we have to calculate the concentration of hydrogen ion.

Now we have to calculate the pH.

Therefore, the pH of the solution is, 2.21

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.