Q19.24P What is the component concentrat... [FREE SOLUTION]

Chapter 19: Q19.24P (page 873)

What is the component concentration ratio, $[N O_{2}^{-}] / [H N O_{2}]$ , of a buffer that has a pH of 2.95( $K_{a}$ of ${HNO}_{2} {= 7.1脳10}^{- 4}$ )?

Short Answer

Expert verified

The component concentration ratio obtained is $\frac{[N {O_{2}}^{-}]}{{[HNO}_{2}]} = 0.63$ .

Step by step solution

Henderson-Hesselbalch Equation

The pH of a buffer solution can be determined by using theHenderson-Hesselbalchequation. The formula to calculate the pH of an acidic buffer solution is:

$pH = pKa + \log \frac{[salt]}{[acid]}$

Calculation

Write the ${HNO}_{2}$ dissociation reaction first.

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

We must alter the Henderson-Hasselbalch equation to find $\frac{[N {O_{2}}^{-}]}{{[HNO}_{2}]}$ .

The pH and $K_{a}$ are given. Therefore, first solve for the ${pK}_{a}$ .

${pK}_{a} {= - logK}_{a} {= - log(7.1脳10}^{- 4}) = 3.15$

Then, solve for $\frac{[N {O_{2}}^{-}]}{{[HNO}_{2}]}$ using the Henderson-Hasselbalch equation as:

role="math" localid="1663389158459" ${pH = pK}_{a} + log \frac{[N {O_{2}}^{-}]}{{[HNO}_{2}]} log \frac{[N {O_{2}}^{-}]}{{[HNO}_{2}]} {= pH - pK}_{a} \frac{[N {O_{2}}^{-}]}{{[HNO}_{2}]} {= 10}^{{pH - pK}_{a}} {= 10}^{2.95 - 3.15} = 0.63.$

Therefore, thecomponent concentration ratio obtained is $\frac{[N {O_{2}}^{-}]}{{[HNO}_{2}]} = 0.63$ .

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91影视

What is the component concentration ratio, $[N O_{2}^{-}] / [H N O_{2}]$ , of a buffer that has a pH of 2.95( $K_{a}$ of ${HNO}_{2} {= 7.1脳10}^{- 4}$ )?

Short Answer

Step by step solution

Henderson-Hesselbalch Equation

Calculation

One App. One Place for Learning.

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91影视

What is the component concentration ratio, [NO2-]/[HNO2], of a buffer that has a pH of 2.95(Kaof HNO2= 7.1脳10-4)?

Short Answer

Step by step solution

Henderson-Hesselbalch Equation

Calculation

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

The Earths Atmosphere

Ionic and Molecular Compounds

Chemistry Branches

Making Measurements

Inorganic Chemistry

Kinetics

Study anywhere. Anytime. Across all devices.

What is the component concentration ratio, $[N O_{2}^{-}] / [H N O_{2}]$ , of a buffer that has a pH of 2.95( $K_{a}$ of ${HNO}_{2} {= 7.1脳10}^{- 4}$ )?