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
solmaris [256]
3 years ago
9

Pyridine is a weak base that is used in the manufacture of pesticides and plastic resins. It is also a component of cigarette sm

oke. Pyridine ionizes in water as follows: C5H5N + H2O ⇌ C5H5NH+ + OH−
The pKb of pyridine is 8.75.
What is the pH of a 0.215 M solution of pyridine? (Assume that the temperature is 25 °C.)
Chemistry
1 answer:
vladimir2022 [97]3 years ago
5 0

Answer:

pH = 9.29

Explanation:

  • C5H5N + H2O ↔ C5H5NH+  +  OH-

∴ pKb = 8.75 = - Log Kb

⇒ Kb = 1.7783 E-9 = [OH-][C5H5NH+]/[C5H5N]

mass balance:

⇒ <em>C</em> C5H5N = 0.215 M = [ C5H5N ] + [C5H5NH+]

charge balance:

⇒ [OH-] = [C5H5NH+]

⇒ Kb = 1.7783 E-9 = [OH-]² / ( 0.215 - [OH-] )

⇒ [ OH-]² + 1.7783 E-9[OH-] - 3.8233 E-10 = 0

⇒ [OH-] = 1.9552 E-5 M

⇒ pOH = 4.708

∴ 14 = pH + pOH

⇒ pH = 9.29

You might be interested in
Which of these substances is a compound <br><br> Carbon<br> Chlorine<br> Uranium <br> Ammonia
svetlana [45]
The answer to this question will be Uranium
4 0
3 years ago
The following diagram best represents​
Ilya [14]

Answer:

Mixture of two elements

Explanation:

You can tell that it is an element since the atoms are only bonded to atoms of the same type.  It is a mixture since the molecules are together in solution but aren't bonded together.

4 0
3 years ago
[(10 kg) × (30 m)]/(5 sec) =​
Flauer [41]

Answer:

10×30kgm/5s

=60kgms^-1

6 0
3 years ago
Petrochemicals are used in some cosmetics. True or False
Hunter-Best [27]
True. Any cosmetic containing paraffin wax, benzene, mineral oil, PEG, DEA, MEA, the suffix ethyl- or propyl-, etc. About 95% of fragrances contain petrochemicals.
4 0
3 years ago
Take your time please.​
Andreyy89

Answer:

1.) Eyewash station --> D

2.) Absorbent material --> G

3.) Fire extinguisher --> F

4.) Safety Shower --> E

5.) Biohazard container --> J

6.) Broken glass container --> I

7.) Safety goggles --> C

8.) Lab apron --> H

9.) asbestos gloves --> A

10.) Latex gloves --> B

Explanation:

In an equipped laboratory, alot of safety equipments are made available and kept in area that it could be easily accessed in the laboratory. Safety or protective equipments are those materials that helps protect a laboratory personnel while at work on the lab.

These equipments include:

--> Eyewash station: This is an equipment used in the laboratory during emergency to rinse chemical from the eye. Therefore option D is correct.

--> Absorbent material: They are used to contain small spills in the laboratory. Therefore option G is correct.

--> Fire extinguisher: This equipment is used to put out small fires. Therefore F is correct.

--> Safety Shower: This is used to rinse away chemical from clothes and on skin during emergency. Therefore option E is correct.

--> Biohazard container: This container is used to safely dispose bacteria culture, blood and other living tissues. Therefore option J is correct.

--> Broken glass container: This is used to dispose cracked, chipped or broken bottle in the laboratory. Therefore option I is correct.

--> Safety goggles: This helps to protect the eye from chemical and broken glasses. Therefore option C is correct.

--> Lab apron: This is worn by the laboratory personnel to help protect the skin from chemical and biohazards. Therefore option H is correct.

--> Asbestos gloves: these are heat resistant gloves used to protect the hands from heat. Therefore option A is correct.

--> Latex gloves: these are equally worn by the laboratory personnel to protect the hands from chemicals and biohazards

6 0
3 years ago
Read 2 more answers
Other questions:
  • If the o2 is collected over water at 25 c (298 k) and 724.0 mm hg total pressure, how many mols o2 will a 1.00 l sample of colle
    12·1 answer
  • describe the" fear appeal" and how it's used in public messaging. Give an example or create your own public health message using
    10·1 answer
  • Which of the following is not a characteristic of a theme
    10·1 answer
  • A nitride ion has 7 protons, 8 neutrons, and 10 electrons. What is the overall charge on this ion?
    5·2 answers
  • When cobalt(II) chloride is added to pure water, the Co2+ ions hydrate. The hydrated form then reacts with the Cl- ions to set u
    9·1 answer
  • <img src="https://tex.z-dn.net/?f=Cu%20%2B%202AgNO_3%20%5Crightarrow%202Ag%20%2B%20Cu%28NO_3%29_2" id="TexFormula1" title="Cu +
    5·1 answer
  • What event does this picture show? (DOK 2)
    15·1 answer
  • Please help! What is the minimum temperature needed to dissolve at least 10 g of KClO3?
    11·1 answer
  • 5 F2 (g) + 2 NH3 (g) -&gt; N2F4 (g) + 6 HF (g)
    15·1 answer
  • (pls help)
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!