Chapter 9: QC E (page 207)

What is the pH of a solution prepared by dissolving 1.23 of
2-nitrophenol (FM 139.11) in 0.250 L?

Short Answer

Expert verified

The pH of 1.23g of 2-nitrophenol in 0.250L is 4.34.

Step by step solution

The formula of pH

The formula of pH of a solution:

$p H = - log A_{H^{+}} p H = - log {[H^{+}]}_{γ H^{+}}$

Calculate the pH of of 2-nitrophenol in .

Given formula mass = 139.11

Acid-equilibria constant = 139.11

Mass of 2-nitrophenol = 1.23 g

Volume of 2-nitrophenol = 0.250 L

The formal concentration is $M_{H A}$ .

$M_{HA} = \frac{1.23 g / (139.11 g / mol)}{0.250 L} = 0.0354 M HA ⇌ H^{+} + A^{-} 0.035400 - x + x + x (0.0354 - x) xx K_{a} = \frac{x^{2}}{(0.0354 - x)} 5.89 \times 10^{- 8} M = \frac{x^{2}}{0.0354 - x} x \approx \sqrt{(0.0354 - x) (5.89 \times 10^{- 8})} x = 4.57 \times 10^{- 5} M$

The of 2-nitrophenol,

$pH = - \log [H^{+}] pH = - \log (4.57 \times 10^{- 5} M) pH = 4.34$

Thus, the pH of 1.23g of 2-nitrophenol in 0.250L is 4.34

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.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

Recommended explanations on Chemistry Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

What is the pH of a solution prepared by dissolving 1.23 of
2-nitrophenol (FM 139.11) in 0.250 L?

Short Answer

Step by step solution

The formula of pH

Calculate the pH of of 2-nitrophenol in .

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Chemical Analysis

Nuclear Chemistry

Organic Chemistry

Ionic and Molecular Compounds

The Earths Atmosphere

Inorganic Chemistry

Study anywhere. Anytime. Across all devices.

What is the pH of a solution prepared by dissolving 1.23 of2-nitrophenol (FM 139.11) in 0.250 L?

Short Answer

Step by step solution

The formula of pH

Calculate the pH of of 2-nitrophenol in .

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Chemical Analysis

Nuclear Chemistry

Organic Chemistry

Ionic and Molecular Compounds

The Earths Atmosphere

Inorganic Chemistry

Study anywhere. Anytime. Across all devices.

What is the pH of a solution prepared by dissolving 1.23 of
2-nitrophenol (FM 139.11) in 0.250 L?