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Chapter 19: Q19.13P (page 873)

What are the $[H_{3} O^{+}]$ and the pH of a buffer that consists of 0.55M ${HNO}_{2}$ and0.75M ${KNO}_{2}$ ( $K_{a}$ of ${HNO}_{2} {= 7.1脳10}^{- 4}$ )?

Short Answer

Expert verified

The pH of propanoic acid is 3.28 and the $[H_{3} O^{+}]$ obtained is $5.2 脳 10^{- 4}$ .

Step by step solution

Ionic Equilibrium

An ionic equilibrium refers to an equilibrium that exists in the solution of weak electrolytes between unionized molecules and ions.

What is H3O + and pH?

Write the 0.55 M ${HNO}_{2}$ dissociation equation first.

${HNO}_{2} {+H}_{2} O 鈬� N {O_{2}}^{-} {+H}_{3} O^{+} .$

Then, write the 0.75 M ${KNO}_{2}$ dissociation equation.

${KNO}_{2} 鈫� N {O_{2}}^{-} {+K}^{+} .$

We now have the initial nitric acid and nitrate.

${HNO}_{2} = 0.55M {NO}_{2}^{-} = 0.75 M$

To find the pH, we may utilize the Henderson-Hasselbalch equation. First, solve for the ${pK}_{a}$ .

role="math" localid="1663406489385" ${pK}_{a} {= - logK}_{a} {= - log(7.1脳10}^{- 4}) = 3.15 pH = pKa + log \frac{[{NO}_{2}^{-}]}{[{HNO}_{2}]} = 3.15 + log \frac{0.75 M}{0.55 M} = 3.28.$

Then, solve for $[H_{3} O^{+}]$ from the calculatedpHas:

$pH = - log [H_{3} O^{+}] [H_{3} O^{+}] {= 10}^{- pH} {= 10}^{- 3.28} {= 5.2脳10}^{- 4}$

Therefore, the values obtained are:

$pH = 3.28. [H_{3} O^{+}] {= 5.2脳10}^{- 4}$

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91影视

What are the $[H_{3} O^{+}]$ and the pH of a buffer that consists of 0.55M ${HNO}_{2}$ and0.75M ${KNO}_{2}$ ( $K_{a}$ of ${HNO}_{2} {= 7.1脳10}^{- 4}$ )?

Short Answer

Step by step solution

Ionic Equilibrium

What is H3O + and pH?

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91影视

What are the [H3O+]and the pH of a buffer that consists of 0.55M HNO2and0.75M KNO2( KaofHNO2= 7.1脳10-4 )?

Short Answer

Step by step solution

Ionic Equilibrium

What is H3O + and pH?

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Kinetics

Organic Chemistry

The Earths Atmosphere

Physical Chemistry

Nuclear Chemistry

Ionic and Molecular Compounds

Study anywhere. Anytime. Across all devices.

What are the $[H_{3} O^{+}]$ and the pH of a buffer that consists of 0.55M ${HNO}_{2}$ and0.75M ${KNO}_{2}$ ( $K_{a}$ of ${HNO}_{2} {= 7.1脳10}^{- 4}$ )?