It is possible to write simple equations to relate pH, pK, and concentrations (c) of various solutions.

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It is possible to write simple equations to relate pH, pK, and concentrations (c) of various solutions. Three such equations are shown here.

1 1 Weak acid: pH = 1pK - log c 1 Weak base: pH = 14.00 - Salt of weak acid (pka) and strong base: 2pKb 2PK

(a) Derive these three equations, and point out the assumptions involved in the derivations.

(b) Use these equations to determine the pH of 0.10 M CH3COOH(aq), 0.10 M NH3(aq), and 0.10 M NaCH3COO(aq). 

Verify that the equations give correct results by determining these pH values in the usual way.

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Related Book For  book-img-for-question

General Chemistry Principles And Modern Applications

ISBN: 9780132931281

11th Edition

Authors: Ralph Petrucci, Jeffry Madura, F. Herring, Carey Bissonnette

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