Question

Write the balanced NET IONIC equation for the reaction that occurs when nitrous acid and potassium hydroxide are combined.

The extent of this reaction is: .
This reaction is classified as .
A. Strong Acid + Strong Base
B. Weak Acid + Strong Base
C. Strong Acid + Weak Base
D. Weak Acid + Weak Base

A. ... Below 50%
B. ... 50%
C. ... Above 50%
D. ... 100%

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Answer 1

HNO2 is a weak acid , reacts with strong base KOH to form salt
and water . Since acid is weak it will not ionize completely in water
molecular equation
HNO2 (aq) + KOH(aq) --> KNO2 (aq) + H2O(l)

total ionic

HNO2 (aq) + K+(aq) + OH-(aq) --> K+(aq) + NO2- (aq) + H2O(l)

spectator ion is K+

Hence
Net ionic equation
***
HNO2 (aq) + OH-(aq) -->   NO2- (aq) + H2O(l)
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This reaction is classified as .

B. Weak Acid + Strong Base
*******************************

In acid base reaction , favored reaction is the formation of weaker
acid and base. This will give very high equilibrium constant
value. That means such king of reaction goes to completion 100%

HNO2 (aq) + OH-(aq) --> + NO2- (aq) + H2O(l)
Here H2O is weaker acid than HNO2 and NO2- is a weaker base than
OH-. Hence the reaction is product favored. Reaction goes to
100 % completion

Answer
Extent of reaction is

D: 100 % completion

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