Chapter 19: Q19.25P (page 873)

What is the component concentration ratio, $[B r O^{-}] / [H B r O]$ ,of a buffer that has a pH of7.95( $K_{a}$ of $H B r O = 2.3 \times 10^{- 9}$ )?

Short Answer

Expert verified

The component concentration ratio obtained is $\frac{{[BrO}^{-}]}{[HBrO]} = 0.20$

Step by step solution

Buffer solution

A buffer solution withstands the change in a pH value. An acidic buffer is formed by combining a weak acid and the salt of its conjugate base.

Evaluate the component concentration ratio

Write theHBrOdissociation reaction first.

${HBrO +H}_{2} O ⇌ H_{3} O^{+} {+ BrO}^{-} .$

We must alter the Henderson-Hasselbalch equation to find $\frac{{[BrO}^{-}]}{[HBrO]}$ .

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

${pK}_{a} {= - logK}_{a} {= - log(2.3×10}^{- 9}) = 8.64$

Then, solve for $\frac{{[BrO}^{-}]}{[HBrO]}$ using the Henderson-Hasselbalch equation as:

${pH = pK}_{a} + log \frac{{[BrO}^{-}]}{[HBrO]} log \frac{{[BrO}^{-}]}{[HBrO]} {= pH - pK}_{a} \frac{{[BrO}^{-}]}{[HBrO]} {= 10}^{{pH - pK}_{a}} {= 10}^{7.95 - 8.64} = 0.20.$

Therefore, thecomponent concentration ratio obtained is $\frac{{[BrO}^{-}]}{[HBrO]} = 0.20$ .

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What is the component concentration ratio, $[B r O^{-}] / [H B r O]$ ,of a buffer that has a pH of7.95( $K_{a}$ of $H B r O = 2.3 \times 10^{- 9}$ )?

Short Answer

Step by step solution

Buffer solution

Evaluate the component concentration ratio

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What is the component concentration ratio, [BrO-]/[HBrO],of a buffer that has a pH of7.95(KaofHBrO=2.3×10-9)?

Short Answer

Step by step solution

Buffer solution

Evaluate the component concentration ratio

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Chemistry Branches

Organic Chemistry

The Earths Atmosphere

Inorganic Chemistry

Ionic and Molecular Compounds

Physical Chemistry

Study anywhere. Anytime. Across all devices.

What is the component concentration ratio, $[B r O^{-}] / [H B r O]$ ,of a buffer that has a pH of7.95( $K_{a}$ of $H B r O = 2.3 \times 10^{- 9}$ )?