Login

How many milliliters of 4.7 M HCl must be added to 3.9 L of 0.11 M...

Free

80.2K

Verified Solution

Question

Chemistry

How many milliliters of 4.7 M HCl must be added to 3.9L of 0.11 M K₂HPO₄ to prepare a pH =7.44 buffer?

Answer & Explanation Solved by verified expert

3.6 Ratings (552 Votes)

K₂HPO₄ MOLES= 3.9 x0.11= 0.429

addition HCl to K₂HPO₄ results in a buffer solution when HCl is added in lesser amount than K₂HPO₄

K₂HPO₄ + HCl ----------------------> KH2PO4 + KCl

0.429Â Â Â Â Â Â Â Â Â aÂ 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 Â Â 0Â Â Â Â Â Â Â Â Â Â Â 0

0.429-aÂ Â Â Â Â Â Â 0Â 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 aÂ Â Â Â Â Â Â Â Â Â Â Â Â a

thus buffer solution contain 'a' moles of KH2PO4 and (0.429-a) moles K₂HPO₄

pKa = -log Ka = -log(6.2 x10^-8) = 7.20

For acidic buffer

Henderson-Hasselbalch equation

pH = pKa + log[salt/acid]

7.44 = 7.20 +log[salt/acid]

0.24 = log[(0.429-a)/a]

[(0.429-a)/a] = 10^0.24= 1.737

0.429 -a = 1.737a

0.429= 2.737a

a= 0.157 mole

M x volume = 0.157

4.7 x V= 0.157

V= 0.0334 L

Volume = 33.4ml of HCl must be added

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: Flex AI - Your personal assistant for all your inquiries!

Become a Member

Other questions asked by students

Medical Sciences

1.2K views

Explain the basics of how does changing temperatures alter oxygen transport and exchanges.Â Â

Biology

1.2K views

During excitatory synaptic transmission the electrical signal carried along the axon of a presynaptic neuron...

Basic Math

1.2K views

The number of graduates of the Code Tank Programming Institute was 758 in 2014 with...

Basic Math

1.2K views

ve the linear programming problem Maximize 2x 5y subject to x 2y 10 3x 2y...

Basic Math

1.2K views

Solve the following equation for a. Be sure to take into account whether a letter...

Calculus

1.2K views

Find an angle A that is coterminal with an angle in radians measuring where 0...

Algebra

1.2K views

the following sum is a right riemann sum for a certain definite integral using a...

Accounting

1.2K views

Please answer both required parts Required information [The following information applies to...

Accounting

1.2K views

Major Case 5 Vivendi Universal "Some of my management decisions turned wrong, but fraud? Never,...

Accounting

1.2K views

Oceanside Marine Company manufactures special metallic materials and decorative fittings for luxury yachts that require...

Accounting

1.2K views

On July 31, 2020, Crane Company paid $2,950,000 to acquire all of the common stock...

Accounting

1.2K views

Required information [The following information applies to the questions displayed below.] Martinez Company's relevant range...

1 Answer

$0.99

~~$1.99~~

(Save $1 )

One time Pay

No Ads
Answer to 1 Question
Get free Zin AI - 50 Thousand Words per Month

Best

Unlimited

$4.99*

~~$9.99~~

(Save $5 )

Billed Monthly

No Ads
Answers to Unlimited Questions
Get free Zin AI - 3 Million Words per Month

*First month only

Free

$0

Get this answer for free!
Sign up now to unlock the answer instantly

You can see the logs in the Dashboard.

Sign In

Don't have an account? Sign Up