Q27P The acid HA has pKa= 4.00. Find ... [FREE SOLUTION]

Chapter 10: Q27P (page 232)

The acid HA has ${pK}_{a}$ = 4.00. Find the fraction in the form HA and the fraction in the form A^- at pH = 5.00. Does your answer agree with what you
expect for the quotient [A2]/[HA] at pH 5.00?

Short Answer

Expert verified

The answer would agree with expected for the quotient at pH 5.00.

Step by step solution

Step 1: Henderson Hasselbalch Equation

One way to determine the pH of a buffer is by using the Henderson鈥揌asselbalch equation, which is pH = pK鈧� + log([A鈦籡/[HA]). In this equation, [HA] and [A鈦籡 refer to the equilibrium concentrations of the conjugate acid鈥揵ase pair used to create the buffer solution.

Calculating fraction in the form HA and the fraction in theform A- at pH = 5.00;

Fraction in the form of HA,

$HA = 伪 (HA) = \frac{[H^{+}]}{[H^{+}] + K_{a}} 伪 (HA) = \frac{10^{- 5}}{10^{- 5} + 10^{- 4}} 伪 (HA) = 0.0909$

Fraction in the form of A^-,

$A^{-} = 伪 (A^{-}) = \frac{K_{a}}{[H^{+}] + K_{a}} 伪 (A -) = \frac{10^{- 4}}{10^{- 5} + 10^{- 4}} 伪 (A -) = 0.909$

From Henderson Hasselbalch Equation;

$pH = {pK}_{a} + \log (\frac{[A^{-}]}{[HA]}) 5.00 = 4.00 + \log (\frac{0.909}{0.0909}) 10 = 10$

Hence, our answer would agree with expected for the quotient $\frac{[A^{-}]}{[HA]}$ at Ph 5.00.

Unlock Step-by-Step Solutions & Ace Your Exams!

Full Textbook Solutions
Get detailed explanations and key concepts
Unlimited Al creation
Al flashcards, explanations, exams and more...
Ads-free access
To over 500 millions flashcards
Money-back guarantee
We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Recommended explanations on Chemistry Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

91影视

The acid HA has ${pK}_{a}$ = 4.00. Find the fraction in the form HA and the fraction in the form A^- at pH = 5.00. Does your answer agree with what you
expect for the quotient [A2]/[HA] at pH 5.00?

Short Answer

Step by step solution

Step 1: Henderson Hasselbalch Equation

Calculating fraction in the form HA and the fraction in theform A- at pH = 5.00;

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Ionic and Molecular Compounds

Kinetics

Nuclear Chemistry

Physical Chemistry

Chemical Analysis

Making Measurements

Study anywhere. Anytime. Across all devices.

91影视

The acid HA has pKa= 4.00. Find the fraction in the form HA and the fraction in the form A- at pH = 5.00. Does your answer agree with what youexpect for the quotient [A2]/[HA] at pH 5.00?

Short Answer

Step by step solution

Step 1: Henderson Hasselbalch Equation

Calculating fraction in the form HA and the fraction in theform A- at pH = 5.00;

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Ionic and Molecular Compounds

Kinetics

Nuclear Chemistry

Physical Chemistry

Chemical Analysis

Making Measurements

Study anywhere. Anytime. Across all devices.

The acid HA has ${pK}_{a}$ = 4.00. Find the fraction in the form HA and the fraction in the form A^- at pH = 5.00. Does your answer agree with what you
expect for the quotient [A2]/[HA] at pH 5.00?