If the K, of a weak base is 1.7 × 10-6, what is the pH of a 0.18 M solution of this base? pH =

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If the K, of a weak base is 1.7 × 10-6, what is the pH of a 0.18 M solution of this base?
pH =
Transcribed Image Text:If the K, of a weak base is 1.7 × 10-6, what is the pH of a 0.18 M solution of this base? pH =
Expert Solution
Step 1

pH of a substance represents the strength of an acid or base. If the pH is small, it is a strong acid and if pH is large, it is a strong base.

 

Step 2

Write the expression of pH.

pH=-logH+

When a base reacts with water, it accepts the proton from water to form hydroxyl ion. Write the reaction of base b with water.

Baq+H2OlBH+aq+OH-aq

  

Step 3

Draw the ICE table for the following reaction.

  B (aq) M H2O (l) M BH+(aq) M OH-(aq) M
I 0.18  - 0 0
C -x - +x +x
E 0.18-x - +x +x

The equilibrium constant of the reaction is

Write the expression of equilibrium constant for this reaction.

Kb=BH+OH-B

 

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