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pH of titration

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Titration Acid/Base

Exactly 100ml of 0.12 Molar nitrous acid (HNO2) are titrated with a 0.12 molar NaOH solution. Calculate the pH for---

A. the initial solution

B. the point after 80ml of the base has been added

C. the equivalence point

D. after 105ml of base has been added

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Solution Summary

It calculates the pH of the solution at different stages of the titration process.

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Ka = 4.0 × 10-4 for HNO2
titration acid/ base

Exactly 100ml of 0.12 Molar nitrous acid (HNO2) are titrated with a 0.12 Molar NaOH solution. Calculate the pH for---

A. the initial solution
HNO2  NO2- + H+
Initial Concentration 0.12 0 0
Equilibrium, M 0.12-x x x
Assume at the equilibrium is x M.
Then
So

Or
M.

B. the point after 80ml of the base has been added ...

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