What is the ph at the half-stoichiometric point for the titration of 0.22 m hno2(aq) with 0.1 m koh(aq)? for hno2, ka = 4.3x10-4?

- pH = 3.37

Solution:- The balanced equation for the reaction of KOH with is written as:

Nitrous acid is a weak acid and KOH is a strong base. So, at half-stoichiometric point half of the acid will be neutralized to form its conjugate base and half of the acid will still be remaining.

It means at half stoichiometric point the solution will have equal moles of weak acid(nitrous acid) and its conjugate base(nitrite ion). It will act as a buffer solution and the pH of the buffer solution is calculated by using Handerson equation:

Since, for the half stoichiometric point, [acid] = [base]

The ratio of their concentrations becomes 1 and the log of 1 is 0.

So, pH = pKa

pKa = - log Ka

pKa = 3.37

So, pH = 3.37

Hence, the pH of the solution at half equivalence point will be 3.37.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

the answer is option a.