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
Varvara68 [4.7K]
3 years ago
10

The pH of a 0.150 molar solution of a weak acid is 4.10. What is the pKa of the acid?

Chemistry
2 answers:
White raven [17]3 years ago
6 0

Answer:

D. 7.4

Explanation:

for plato users

#PLATOLIVESMATTER

Kamila [148]3 years ago
3 0
Answer: 4.21×10⁻⁸

Explanation:


1) Assume a general equation for the ionization of the weak acid:

Let HA be the weak acid, then the ionization equation is:

HA ⇄ H⁺ + A⁻

2) Then, the expression for the ionization constant is:

Ka = [H⁺][A⁻] / [HA]

There, [H⁺] = [A⁻], and [HA] = 0.150 M (data given)


3) So, you need to determine [H⁺] which you do from the pH.

By definition, pH = - log [H⁺]

And from the data given pH = 4.1


⇒ 4.10 = - log [H⁺] ⇒ [H⁺] = antilog (- 4.10) = 7.94×10⁻⁵

4) Now you have all the values to calculate the expression for Ka:

ka = 7.94×10⁻⁵ × 7.94×10⁻⁵ / 0.150 = 4.21×10⁻⁸
You might be interested in
A sample of polonium-210 has an initial mass of 390 milligrams (mg). If the half-life of polonium-210 is 36 days, how many mg of
kondaur [170]

Answer: D. 48.75

Explanation: just took the test

5 0
2 years ago
Read 2 more answers
Igneous rock___to form magma a)melts b)weathers c)compacts d)crystallizes NEED HELP ASAP
dangina [55]

Answer:

should be A)Melts.Because magma is liquid i think

5 0
3 years ago
Read 2 more answers
How to calculate IMA
Cloud [144]
Using IMA is used in Engineering, but there is a simple rhyme I use called IMA Deer. IMA=De/Dr

7 0
3 years ago
Please answer PLEASE ILL GIVE BRAINLIEST
netineya [11]
C ! ..........................
3 0
3 years ago
Read 2 more answers
The transition of an electron from an excited energy state to the ground state always results in
Monica [59]

The transition of an electron from an excited energy state to the ground state always results in B. the emission of electromagnetic radiation.

The electron is going from a high-energy state to one of low energy, so it emits this excess energy as electromagnetic radiation. This <em>may be visib</em>le light, but it <em>may also not be visible</em> to our eyes.


3 0
2 years ago
Other questions:
  • Which statement correctly compares an atom of an alkali metal with an atom of the alkaline earth metal next to it on the periodi
    9·1 answer
  • Identify the neutralization reaction
    10·1 answer
  • At what temperature is the following reaction at equilibrium? 2Na, O, + 2H,0 + 4NaOH + O, AH° = -109 kJ, ASO = -133.2 J/K
    7·1 answer
  • What is the number of moles in 500L of He gas at STP
    10·1 answer
  • If 625 ml of pure water is added to 344 ml of 1.675 m na2so4, what is the new concentration of na2so4?
    5·1 answer
  • Assume that the pressure inside of the 1 liter balloon is 200,000 Pa, what is the explosive energy in the inside the balloon? Ex
    6·1 answer
  • what is the chemical equation in words for 2 C2H2 (g) + 5 O2 (g) ---------&gt; 4 CO2 (g) + 2 H2O (l )
    15·1 answer
  • Select all of the following statements that represent the differences between a voltaic cell and an electrolytic cell. Group of
    12·1 answer
  • What happens when a nitrogen molecule is formed from two nitrogen atoms?
    11·2 answers
  • The solubility of potassium sulfate in water is 16 grams per 100
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!