Calculate the pH of a 0.105 mol/L solution of carbonic acid. Answer is 3.668. How do...

Free

90.2K

Verified Solution

Question

Chemistry

Calculate the pH of a 0.105 mol/L solution of carbonic acid.Answer is 3.668. How do I show my work for this question

Answer & Explanation Solved by verified expert

3.9 Ratings (545 Votes)

Solution :-

Carbonic acid reaction with water

H2CO3 + H2O ------ > H3O+ + HCO3-

0.105Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â 0

-xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â Â Â Â Â Â Â +x

0.105-xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â xÂ Â Â Â Â Â Â Â Â Â Â Â Â x

ka= [H3O+][HCO3-]/[H2CO3]

4.3*10^-7 = [x][x]/[0.105-x]

since the ka is very small so we can neglect the x from denominator

4.3*10^-7 * 0.105 = x^2

4.515*10^-8 = x^2

taking square root of both sides

2.125*10^-4 = x= [H3O+]

formula to calculate the pH is as follows

pH= -log [H3O+]

pH= -log [2.125*10^-4]

pH= 3.67

the ka2 of the carbonic acid is not considered because it is very small so it is negligible.

Get Answers to Unlimited Questions

Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!

Membership Benefits:

Unlimited Question Access with detailed Answers
Zin AI - 3 Million Words
10 Dall-E 3 Images
20 Plot Generations
Conversation with Dialogue Memory
No Ads, Ever!
Access to Our Best AI Platform: Zin AI - Your personal assistant for all your inquiries!

Become a Member

Calculate the pH of a 0.105 mol/L solution of carbonic acid. Answer is 3.668. How do...

Free

90.2K

Verified Solution

Question

Chemistry

Calculate the pH of a 0.105 mol/L solution of carbonic acid.Answer is 3.668. How do I show my work for this question

Answer & Explanation Solved by verified expert

Get Answers to Unlimited Questions

Membership Benefits:

Other questions asked by students

Question 4 8 1 6 he two given samples as independent or dependent The test...

Can you please just answer part 2! Thank you 1. Suppose x(t) is a square wave...

TOPIC 2: Use Figure 2.6 Maslow's Hierarchy of Needs and the accompanying text in Chapter 2...

ed on your own knowledge and the information presented in this lesson what do all...

Assume that 75% of people are left-handed. If we select 5 people at random, find...

For which of the following experiments wouldthe results show in an experimental probabilityof 3/5?A A...

Let P 1 1 Q 3 5 R 1 4 Part 1 Find the component...

The slope of the tangent line to the parabola y 2x 2x 5 at the...

3 This graph represents the first hypothetical described in the video Imagine someone invests 10...

Required information Skip to question [The following information applies to the questions displayed below.] Data...

Problem 15-20 Determining sales and variable cost volume variances LO 15-2, 15-3, 15-4 Adams Publications...

2c) When compiling a budget, what kind of standard would you use? Give REASONS for...