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Chapter 9: Q3TY (page 196)

Find the pH of 0.10 M methylamine.

Short Answer

Expert verified

The pH value for methylamine is 11.80

Step by step solution

01

Step 1: Define the term PH.                      

The negative logarithm of H+ion concentration is used to calculate pH. As a result, the meaning of pH is justified as hydrogen power.

02

Calculate the ph.

0.10M methylamine

Kb=KwKa=10-1410-10.632=4.3脳10-4

Kb=CH3NH3H2+OCH3NH2Kb=x20.10-x4.3脳10-4=x20.10-X

By using quadratic equation solve The value of x .

x=6.78脳10-3

From the x value the is calculated as

pH=-logOH-=-log6.78脳10-3=2.17pH+pOH=14pH=14-2.17=11.83

Thus the Ph value for methylamine is 11.8

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