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
fredd [130]
3 years ago
8

Calculate the percent ionization of nitrous acid in a solution that is 0.222 M in nitrous acid (HNO3) and 0.278 M in potassium n

itrite (KNO2). The acid dissociation constant of nitrous acid is 4.50 x 10-4 A) 55.6 B) 0.162 C) 15.5 D) 2.78 * 10-3
Chemistry
1 answer:
RideAnS [48]3 years ago
5 0

Explanation:

Concentration of KNO_{2} is 0.278 M and it is completely ionized into K^{+} and NO^{-}_{2}.

This means that [KNO_{2}] = [NO_{2}] = 0.278 M

It is given that concentration of HNO_{2} is 0.222 M.

As HNO_{2} is a weak acid. Therefore, its dissociation will be as follows.

              HNO_{2}(aq) \rightarrow H^{+}(aq) + NO^{-}_{2}(aq)

Initially :    0.222 M            0        0.278 M

Change :    - x                    +x           +x

Equilibrium : 0.222 M - x    x         0.278 M + x

Therefore, dissociation constant for this reaction will be as follows.

        K_{a} = \frac{[H^{+}][NO^{-}_{2}]}{[HNO_{2}]}

Hence, putting the given values into the above formula as follows.

        K_{a} = \frac{[H^{+}][NO^{-}_{2}]}{[HNO_{2}]}

      4.50 \times 10^{-4} = \frac{x \times (0.278 + x)}{(0.222 - x)}

                          x = 0.00036

As, [H^{+}] is 0.00036 M. Therefore, percentage ionization of HNO_{2} will be calculated as follows.

              % ionization of HNO_{2} = \frac{[H^{+}]}{[HNO_{2}]} \times 100

                               = \frac{0.00036 M}{0.222 M} \times 100

                               = 0.16 %

Thus, we can conclude that % ionization of HNO_{2} is 0.16%.

You might be interested in
What information would you find on a WHIMIS label?
Nady [450]
Answer/explanation:

Product identifier – the brand name, chemical name, common name, generic name or trade name of the hazardous product.
Initial supplier identifier – the name, address and telephone number of either the Canadian manufacturer or the Canadian importer.
8 0
2 years ago
In 3–5 sentences, explain why electrical wires are often constructed from metal coated with rubber, and how that is similar to m
stich3 [128]

Answer:

Covering electrical wires in plastic guarantees that the electrons flowing through the wires will not flow through your body when the wire is touched.

Explanation:

"The purpose of insulation covering the metal part of an electrical wire is to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors."

https://www.allaboutcircuits.com/worksheets/wire-types-and-sizes/#:~:text=Most%20electrical%20wire%20is%20covered,or%20plastic%20coating%20called%20insulation.&text=The%20purpose%20of%20insulation%20covering,current%20through%20those%20other%20conductors.

https://www.hunker.com/13414152/why-are-electrical-wires-covered-in-plastic

7 0
2 years ago
An ice cube tray full of water is put into a freezer. Which energy change occurs in the particles in the water as it undergoes a
o-na [289]

Answer:

A

Explanation:

increase in energy - hotter and/or more reactive

decrease in energy - colder and/or less reactive

Since it is going from a liquid to solid it will have a tighter arrangement of particles.

3 0
2 years ago
Plzs help<br>What type of organic compound is used for building cell parts?
Maru [420]
Carbohydrates! hope this helped!
4 0
2 years ago
Read 2 more answers
A sample of a substance has a mass of 4.2 grams and a volume of 6 milliliters. The density of this substance BLANK) ( grams/mill
elena55 [62]

0.7 my teacher just gave me the answer i got too lazy to explain why

3 0
3 years ago
Read 2 more answers
Other questions:
  • X why is cyano group called as an<br>ambident group?​
    5·1 answer
  • If you were in a completely dark room, the room would still be "shining" in this type of light:
    7·1 answer
  • How are baby’s produced.
    10·2 answers
  • When studying pea plants, Gregor Mendel made many interesting discoveries and came to a few conclusions about what happens as a
    9·1 answer
  • How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?
    8·1 answer
  • When 4.31 g of a nonelectrolyte solute is dissolved in water to make 345 mL of solution at 25 °C, the solution exerts an osmotic
    8·1 answer
  • What type of reaction is this?—- Large Compound=Element A+Element B
    8·1 answer
  • Fe2O3 + 2Al = 2Fe + Al2O3 is this a redox reaction
    14·1 answer
  • What is the pH value of distilled water?
    13·2 answers
  • What the answer. the correct answer ​
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!