Chapter 9: Q13P (page 208)

Barbituric acid dissociates as follows:
(b)Calculate the pH and fraction of dissociation of 10^-10.00 M barbituric acid.

Short Answer

Expert verified

The $pH of 10^{- 10.00} M is 7$

The fraction of disassociation is 99.9%

Step by step solution

Step 1 : Definition of pH.

pH is defined as a quantitative measure of acidity and basicity. Compounds having pH more than 7 is acidic in nature while when shown above than 7 is basic in nature. When pH comes 7 , compound is said to be neutral.

Step 2 : Calculate pH and fraction of dissociation.

Since the solution is highly diluted, we can consider that $pH = 7 ([H^{+}] = 10^{- 7})$ .

We will calculate the fraction of dissociation by:

$K_{a} = \frac{[H^{+}] [A^{-}]}{[HA]} [A^{-}] = \frac{K_{a}}{[H^{+}]} \times [HA] = \frac{9.8 \times 10^{- 5}}{10^{- 7}} \times [HA] [A^{-}] = 980 [HA]$

Step 3 : Calculate fraction of dissociation.

Now, using the same reaction, we will find fraction of dissociation:

$a = \frac{[A^{-}]}{[HA] + [A^{-}]} = \frac{980 [HA]}{[HA] + 980 [HA]} = 980 / 981 = 99.9 %$

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.

Barbituric acid dissociates as follows:
(b)Calculate the pH and fraction of dissociation of 10^-10.00 M barbituric acid.

Short Answer

Step by step solution

Step 1 : Definition of pH.

Step 2 : Calculate pH and fraction of dissociation.

Step 3 : Calculate fraction of dissociation.

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

The Earths Atmosphere

Kinetics

Making Measurements

Ionic and Molecular Compounds

Inorganic Chemistry

Nuclear Chemistry

Study anywhere. Anytime. Across all devices.

Barbituric acid dissociates as follows:(b)Calculate the pH and fraction of dissociation of 10-10.00 M barbituric acid.

Short Answer

Step by step solution

Step 1 : Definition of pH.

Step 2 : Calculate pH and fraction of dissociation.

Step 3 : Calculate fraction of dissociation.

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

The Earths Atmosphere

Kinetics

Making Measurements

Ionic and Molecular Compounds

Inorganic Chemistry

Nuclear Chemistry

Study anywhere. Anytime. Across all devices.

Barbituric acid dissociates as follows:
(b)Calculate the pH and fraction of dissociation of 10^-10.00 M barbituric acid.