Respuesta :

The pH of a 0.40 m h2se solution that has the stepwise dissociation constants is 2.15.

First, we can neglect the Ka2 value and use Ka1:

so,

Ka1 = [H+][HSe-] / [H2Se]

so by substitution:

1.3 x 1/10⁴ = X*X / (0.4 -X) by solving for X

∴X  = 0.00715

∴[H+] = 0.00715

∴pH = -㏒[H+]

       = -㏒ 0.00715

       = 2.15

What is pH?

  • pH is a measure of the acidity/base of water. The range is 0 to 14, with 7 being neutral.
  • A pH below 7 indicates acidity, while a pH above 7 indicates basicity.
  • pH is essentially a measure of the relative amount of free hydrogen and hydroxyl ions in water.
  • Water containing more free hydrogen ions is acidic, while water containing more free hydroxyl ions is basic.

To know more about pH, click the link given below:

https://brainly.com/question/29766400

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