1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lesechka [4]
3 years ago
12

A buffer of pH 9.24 is to be prepared from a weak acid and its salt. The best acid from which to prepare the buffer is

Chemistry
1 answer:
I am Lyosha [343]3 years ago
5 0

Answer:

(C) arsenious acid, Ka = 6 x 10⁻¹⁰

Explanation:

A buffer is prepared by a weak acid and the conjugate base coming from its salt. Its function is to resist abrupt changes in pH when an acid or a base are added. The best working range of a buffer is in the range of pKa ± 1. Let's consider the 5 options and their pKa (pKa = -log Ka).

(A) phthalic acid, K1 = 1.3 x 10⁻³ (1st ionization)     pKa = 2.9

(B) hydrogen phthalate, K2 = 3.9 x 10⁻⁵                pKa = 4.4

(C) arsenious acid, Ka = 6 x 10⁻¹⁰                           pKa = 9

(D) formic acid, Ka = 1.8 x 10⁻⁵                               pKa = 4.7

(E) phenol, Ka = 1.3 x 10⁻¹⁰                                      pKa = 9.8

The acid whose pKa is closer to the desired pH is arsenious acid. Its working range of pH is 8 - 10. In the second place, phenol could work as a buffer system since the working pH range is 8.8 - 10.8.

You might be interested in
What occurs during a chemical reaction? *
Romashka [77]

Answer:

c. Atoms of two or more elements bond together

Explanation:

a chemical reactions forms products ( new substances); where it rearranges themselves to form new bonds.

7 0
2 years ago
Read 2 more answers
GR 11 CHEM M3
galina1969 [7]

<em>A:  When burning Sulfur, Sulfur Dioxide is released. Having more Oxygen available provides more reactive potential for the burning Sulfur, making it burn much more fiercely. In water, the Sulfur Dioxide forms Sulfurous acid. Added: 12 years ago.</em>

<em />

<em>Explanation:</em>

<h3><em /></h3>
6 0
3 years ago
if a standard die is rolled twice what is the probability of getting a perfect square,then a number that is less than 5.
Amanda [17]
There are three perfect squares in a standard die; 1, 2, 4. If there is two standard dies, then the probability of getting a perfect square is 1/3 x 1/3 = 1/9. 
There are 4 numbers less than 5 in a standard die, making it 1/4 x 1/4=1/16. 
7 0
3 years ago
What is a scatter plot?
pogonyaev

Explanation:

A..........is the correct answer

if it helps you then plzz mark me brainliest

6 0
3 years ago
Read 2 more answers
What happens when the two atoms get even closer?
SVETLANKA909090 [29]

Answer:

If two atoms get close enough together then the electrons of each atom will be attracted to both nuclii

Explanation:

7 0
2 years ago
Read 2 more answers
Other questions:
  • Most tornadoes carry wind speeds that range from
    13·1 answer
  • Use the formula for pressure to determine the weight of a box that creates a pressure of 1,065 N/cm 2 when resting on a 17.0-cm
    10·2 answers
  • A balloon contains 0.15 moles of co2 gas. how many molecules of co2 are in the balloon?
    7·2 answers
  • A balloon, whose volume at 23°C is 535 mL, is heated to 46°C. Assuming the pressure and amount of gas remain constant, what is t
    7·2 answers
  • We’ve all heard of acid rain and its impact on the environment, the infrastructure, like roads and buildings, and on humans. If
    12·1 answer
  • Help me please thanks
    15·1 answer
  • Question: Which of the following could be a phenotype?
    5·2 answers
  • What are the 3 types of water?​
    15·2 answers
  • What are molecules, and how are the properties of molecules different from the atoms they come from? Give an example.
    10·1 answer
  • What is a Newton?<br> explain please
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!