If a buffer solution is 0.120 M in a weak acid (Ka = 3.5 × 10-5)...
Homework Answers
Concentration of a weak acid is related to its 
and pH of a solution as shown in the following Henderson -Haselbach equation.
![[salt]
pH pklogSalt]
[acid]](http://img.homeworklib.com/questions/f4984170-78ce-11ea-b644-79d782ec57af.png?x-oss-process=image/resize,w_560)
Here, 
is the acid dissociation constant; ![salt]](http://img.homeworklib.com/questions/f53d8080-78ce-11ea-b8e6-53a29ccf002f.png?x-oss-process=image/resize,w_560)
, and![[acid]](http://img.homeworklib.com/questions/f58ca4b0-78ce-11ea-b572-413f1c0945d6.png?x-oss-process=image/resize,w_560)
are the concentration terms of the salt and the acid respectively. This equation is applicable to a system that contains weak acids or weak bases only.
Because the acid is a weak acid, we can use the above equation to calculate the pH.
The value of pH for the solution can calculate by substituting the concentration values in the formula.
An aqueous solution that contains a mixture of a weak acid and its conjugate base or vice versa is called as buffer solution.
Conjugate base differs with a proton
to its acid.
Consider the weak acid as HA. It is dissociated as shown below.
The Henderson -Haselbach equation can be written as follows:
![[A]
pH pKalog
[HA](http://img.homeworklib.com/questions/f68b7e90-78ce-11ea-b684-491e13a8ba4a.png?x-oss-process=image/resize,w_560)
Calculate the value of 
and then pH of the solution by substituting the concentrations in the equation.
Now calculate the pH as follows:
![[A]
pH pK,logHA
[HA
=4.45+log0.500
0.120
4.45 0.6197
= 5.06](http://img.homeworklib.com/questions/f78e5f30-78ce-11ea-a3cb-2366eabaf84b.png?x-oss-process=image/resize,w_560)
Thus, the pH of the solution is 
.
If a buffer solution is 0.120 M in a weak acid (Ka = 2.8 × 10-5)...
If a buffer solution is 0.120 M in a weak acid (Ka = 2.8 × 10-5) and 0.460 M in its conjugate base, what is the pH?
If a buffer solution is 0.120 M0.120 M in a weak acid (?a=7.5×10−5)Ka=7.5×10−5) and 0.440 M0.440 M in its conjugate base...
If a buffer solution is 0.120 M0.120 M in a weak acid (?a=7.5×10−5)Ka=7.5×10−5) and 0.440 M0.440 M in its conjugate base, what is the pH?
If a buffer solution is 0.170 M in a weak acid (Ka = 7.2 x 10-5)...
If a buffer solution is 0.170 M in a weak acid (Ka = 7.2 x 10-5) and 0.500 M in its conjugate base, what is the pH? pH =
If a buffer solution is 0.130 M in a weak acid (Ka = 7.8 × 10-5)...
If a buffer solution is 0.130 M in a weak acid (Ka = 7.8 × 10-5) and 0.470 M in its conjugate base, what is the pH?
If a buffer solution is 0.270 M in a weak acid (Ka = 8.6 x 10-5)...
If a buffer solution is 0.270 M in a weak acid (Ka = 8.6 x 10-5) and 0.410 M in its conjugate base, what is the pH? pH =
If a buffer solution is 0.240 M in a weak acid Ka=6.2×10−5) and 0.420 M in...
If a buffer solution is 0.240 M in a weak acid Ka=6.2×10−5) and 0.420 M in its conjugate base, what is the pH?
If a buffer solution is 0.260 M in a weak acid (Ka = 5.5 x 10-5)
If a buffer solution is 0.260 M in a weak acid (Ka = 5.5 x 10-5) and 0.440 M in its conjugate base, what is the pH?
If a buffer solution is 0.290 M in a weak acid (Ka = 2.2 x 10-5)...
If a buffer solution is 0.290 M in a weak acid (Ka = 2.2 x 10-5) and 0.550 M in its conjugate base, what is the pH? pH = 4.382 Incorrect
If a buffer solution is 0.300 M in a weak acid (Ka = 2.6 rature selatan...
If a buffer solution is 0.300 M in a weak acid (Ka = 2.6 rature selatan 1 0200 min wenk sece 6 =262 10-3and o svom in te conjune base what's the per d 0.470 M in its conjugate base, what is the pH? pH = pH= If a buffer solution is 0.400 M in a weak acid (Ka = 7.6 x 109) and 0.260 M in its conjugate base, what is the pH? pH =
If a buffer solution is 0.150 M in a weak base (?b=3.5×10−5) and 0.430 M in...
If a buffer solution is 0.150 M in a weak base (?b=3.5×10−5) and 0.430 M in its conjugate acid, what is the pH? pH =
If a buffer solution is 0.170 M in a weak acid (Ka = 7.2 x 10-5) and 0.500 M in its conjugate base, what is the pH? pH =
If a buffer solution is 0.270 M in a weak acid (Ka = 8.6 x 10-5) and 0.410 M in its conjugate base, what is the pH? pH =
If a buffer solution is 0.290 M in a weak acid (Ka = 2.2 x 10-5) and 0.550 M in its conjugate base, what is the pH? pH = 4.382 Incorrect
If a buffer solution is 0.300 M in a weak acid (Ka = 2.6 rature selatan 1 0200 min wenk sece 6 =262 10-3and o svom in te conjune base what's the per d 0.470 M in its conjugate base, what is the pH? pH = pH= If a buffer solution is 0.400 M in a weak acid (Ka = 7.6 x 109) and 0.260 M in its conjugate base, what is the pH? pH =
Most questions answered within 3 hours.
-
The area of an elastic circular loop decreases at a constant
rate, dA/dt = −6.60×10−3 m2/s...
asked 29 minutes ago -
The denaturation of proteins can be described by the
equilibrium
F⇌U
where F and U represent...
asked 2 hours ago -
Please answer what the maximum and minimum force is, and the
angle on the ion is...
asked 2 hours ago -
implement a program that reads a number of rows and a symbol.
The program will draw...
asked 2 hours ago -
Assume that when adults with smartphones are randomly selected,
45% use them in meetings or classes....
asked 2 hours ago -
Determine the number of formula units of
Na2SO4 and moles of oxygen contained in 8.11
moles...
asked 2 hours ago -
Explain in steps on the following code
What would be the output when executed
using System;...
asked 2 hours ago -
Given the information in the table, which of the following
statements is CORRECT?
Stock A
Stock...
asked 2 hours ago -
Write MARIE assembly language programs that do the following:
Write a program that inputs an integer...
asked 2 hours ago -
Explain an understanding of services and protocols.
Explain the job of DNS.
Explain the three email...
asked 2 hours ago -
(As soon as possible) Balance each of the following equations
according to the half-reaction method:
H2O2(aq)...
asked 3 hours ago -
A thin rod with a mass of 3.5kg and a length L=1.5 m is oriented
horizontally....
asked 3 hours ago