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Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter3: Using Spreadsheets In Analytical Chemistry

Section: Chapter Questions

Problem 3.4QAP

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<CHE154 S20 Ch17 Sec7-9
Chapter 17 Algorithmic Question 64
Part A
Calculate the pH of a 1.50 M CH3NH3CI solution. K, for methylamine, CH3NH2, is 4.4 x 104.
8.77
1.59
O5.23
12.41
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Expert Solution

Step 1

Methylammonium chloride dissociates into quaternary ammonium ion (CH3NH₃⁺) and chloride ions (Cl^-). Chloride ion (Cl^-) is the conjugate base of a strong acid so it will not influence the pH of the solution. Methylammonium ion is the conjugate acid of a weak base, so an acid-dissociation reaction determines the pH of the solution.

The balance equation is given below,

Step 2

K_a value of CH3NH₃⁺ is calculated,

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