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
UkoKoshka [18]
3 years ago
8

The pH of a 0.25 M aqueous solution of hydrofluoric acid, HF, at 25.0 °C is 2.03. What is the value of Ka for HF?

Chemistry
2 answers:
Mazyrski [523]3 years ago
8 0
Last option that is none of above is right answer.
MrRa [10]3 years ago
7 0

Answer : The correct option is, 3.5\times 10^{-4}

Solution : Given,

pH = 2.03

Concentration of HF = 0.25 M

First we have to calculate the concentration of H^+ ion.

pH=-\log [H^+]

2.03=-\log [H^+]

[H^+]=9.3\times 10^{-3}M

Now we have to calculate the value of K_a for HF.

The equilibrium reaction will be

HF\rightleftharpoons H^++F^-

Concentration of H^+ = Concentration of F^- = 9.3\times 10^{-3}M

The expression for K_a for HF will be,

K_a=\frac{[H^+][F^-]}{[HF]}=\frac{(9.3\times 10^{-3})\times (9.3\times 10^{-3})}{0.25}=3.5\times 10^{-4}

Therefore, the value of K_a for HF is, 3.5\times 10^{-4}

You might be interested in
HELP!!! WILL MARK BRAINLIEST!!!
Sophie [7]

Answer:

A , B, C

Explanation: D is a Diamagnetic

8 0
3 years ago
How many mole ratios can be correctly obtained from the chemical equation 2Al2O3(l) ® 4Al(s) + 3O2(g)?
scoundrel [369]

Answer:

6

Explanation:

3 0
3 years ago
What is the basic unit of structure and function in all living things? a cell b organism c atom d plasma
valkas [14]

Answer:

A. Cell

Explanation:

Cells are basic units of structure and function in living things. This means that cells form the parts or an organism and carry out all of the an organism's processes, or functions.

4 0
2 years ago
What determines the speed at which a particle of matter moves
Zepler [3.9K]

Answer:

The force exerted on it.

Explanation:

As the law of motion states, an object at rest will remain at rest an object in motion will remain in motion unless acted upon by another force.

5 0
3 years ago
A certain plant requires moisture oxygen carbon dioxide light and minerals in order to survive.This statement describes a living
TEA [102]
The Answer is C. Abiotic Factors
3 0
3 years ago
Other questions:
  • How many moles of malachite should be formed when 1.5 moles of copper sulphate reacts with an excess of sodium carbonate?
    10·1 answer
  • can someone help me more clearly understand the difference between heterogeneous and homogeneous? Give an example of each plz.
    6·1 answer
  • Compared with clouds, fogs are ____
    10·2 answers
  • Where can you find the information needed to change grams of a substance to moles?
    5·1 answer
  • A flask and a beaker each contain the same amount of water. How are they similar? How are they different?
    14·2 answers
  • What is a compound?
    5·2 answers
  • The correct answer for the addition of 5.8 g + 2.26g + 1.311g + 2 g is?
    7·1 answer
  • 7. What are the coefficients needed to balance the following chemical equation?
    9·1 answer
  • 23. What is the molarity of NO3- in each solution?
    12·1 answer
  • For each of the following compounds, state whether it is ionic or covalent. If it is ionic, write the symbols for the ions invol
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!