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
Nikolay [14]
3 years ago
9

What concentration of benzoic acid will have a ph of 4.0? (for benzoic acid, pka=4.20)?

Chemistry
1 answer:
aalyn [17]3 years ago
7 0
We are given the molar concentration of an aqueous solution of weak acid and the pH ofthe solution, and we are asked to determine the value of Ka for the acid.
The first step in solving any equilibrium problem is to write the equation for the equilibriumreaction. The ionization of benzoic acid can be written as seen in the attached image (1).
The equilibrium-constant expression is the equation number (2)
From the measured pH, we can calculate pH as seen in equation (3)
To determine the concentrations of the species involved in the equilibrium, we imagine that thesolution is initially 0.10 M in HCOOH molecules. We then consider the ionization of the acidinto H+ and HCOO-. For each HCOOH molecule that ionizes, one H+ ion and one HCOO- ionare produced in solution. Because the pH measurement indicates that [H+] = 1x 10^-4 M atequilibrium, we can construct the following table as seen in the equation number (4)
To find the value of Ka, please see equation (5):
We can now insert the equilibrium concentrations into the expression for Ka as seen in equation (6)
Therefore, 2.58x10^-4 M is the concentration of benzoic acid to have a pH of 4.0

You might be interested in
Whats the balanced equation for sodium hydroxide + ammonium sulphate=sodium sulphate + amonia + h2o​
Nady [450]

Answer:

2NaOH + (NH4) 2SO4 = Na2SO4(s) + 2NH3(g) + 2H2O(l)

Two moles of sodium hydroxide reacts with 1 Mike of ammonium sulphate to give 1 mole of Sodium sulphate, 2 moles of ammonia gas and 2 moles of water

Explanation:

7 0
2 years ago
Do step 3 as outlined in the lab guide. Record your results in the appropriate blanks.
PolarNik [594]

Explanation:

Do the step 3 as outlined in the lab guide. record your results in the appropriate blank.

D

8 0
3 years ago
How many grams are in 6.00 moles of NaCl?
Anastasy [175]

Is it 350.4, I assume?

5 0
2 years ago
Read 2 more answers
Science can best be described as
Savatey [412]
A way of building knowledge about the world around us through observation and experimentation.
8 0
2 years ago
[OH-] for a solution is
solong [7]

Answer:

B = basic

Explanation:

Given data:

[OH⁻] = 5.35×10⁻⁴M

pH = ?

Solution:

pOH = -log[OH⁻]

pOH = - [5.35×10⁻⁴]

pOH = 3.272

it is known that,

pH + pOH = 14

pH = 14- pOH

pH = 14 - 3.272

pH = 10.728

The acidic pH is range from zero to less than 7 while 7 pH is neutral and above 7 the pH is basic. So, the given solution is basic.

8 0
3 years ago
Read 2 more answers
Other questions:
  • In an organism, the brain directs the body how to respond to stimuli from the environment. In a cell, this function is performed
    7·1 answer
  • Compounds are neutral substances. true false
    10·1 answer
  • Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many liters of hydrogen gas ar
    11·1 answer
  • Controlled nuclear chain reactions A. take place in nuclear reactors. B. are always fusion reactions. C. never produce radioacti
    5·1 answer
  • Energy Reaction Diagram FOR Cellular Respiration: O2 + C6H12O6 —> CO2 + H2O
    12·1 answer
  • Select the group of organelles that is common to both plant cells and animal cells.
    9·2 answers
  • HHHHEEELLLPPPP PLZ ANd thanks mfs .
    14·1 answer
  • The 38 elements in groups 3 through 12 of the periodic table are called "Alkaline Earth Metals" O True O False​
    7·2 answers
  • Wegener's claim was that the continents drifted from their original positions in Pangea
    6·1 answer
  • What does Fe(NO3)2 + Cu stands for?​
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!