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
elena-14-01-66 [18.8K]
3 years ago
10

What is the pH of a buffer that is 0.100 M methylamine and 0.175 M methylammonium chloride at 25 °C? pkb for methylamine = 3.36

.
Chemistry
1 answer:
bekas [8.4K]3 years ago
4 0

Answer:

pH = 10.396

Explanation:

CH3NH2 + H2O ↔ CH3NH3+  +  OH-

⇒ pKb = -log ( Kb ) = 3.36

⇒ Kb = 4.365 E-4 = ( [ CH3NH3+ ] * [ OH- ] ) / [ CH3NH2 ]

CH3NH3Cl ↔   CH3NH3+  +  Cl-

  0.175 M            0.175 M       0.175 M

mass balance:

M CH3NH2 + M CH3NH3Cl = [ CH3NH3+ ] + [ CH3NH2 ] = 0.100 + 0.175 = 0.275

load balance:

[ CH3NH3+ ] = [Cl- ] + [ OH- ] ......... [ OH- ] from water

∴ [ Cl- ] = 0.175 M

⇒ [ CH3NH3+ ] = 0.175

in the mass balance:

⇒ 0.275 = 0.175 + [ CH3NH2 ]

⇒ 0.1 = [ CH3NH2 ]

⇒ Kb = 4.365 E-4 = (( 0.175 ) * [ OH- ] ) / (0.1 )

⇒ 4.365 E-5= 0.175 [ OH-]

⇒ [ OH- ] = 2.494 E-4

⇒ pOH = - log ( 2.494 E-4)

⇒ pOH = 3.6

⇒ pH = 14 - pOH

⇒ pH = 10.396

You might be interested in
Consider the reversible reaction, A+B⇌C+D. If the concentration of product D is increased, the rate of the reverse reaction woul
natali 33 [55]

Answer:

If the concentration of product D is increased, the rate of the reverse reaction would increase.

Explanation:

Chemical reaction:

A + B ⇄ C + D

In given condition the equilibrium is disturb by increasing the concentration of product.

When the concentration of product D is increased the system will proceed in backward direction in order to regain the equilibrium. Because when the product concentration is high it means reaction is not on equilibrium state the reaction will proceed backward direction to regain the equilibrium state.

According to the Le- Chatelier principle,

At equilibrium state when stress is applied to the system, the system will behave in such a way to nullify the stress.

The equilibrium can be disturb,

By changing the concentration

By changing the volume

By changing the pressure

By changing the temperature

4 0
3 years ago
What is the function of these organelles?
Vladimir [108]

Answer:

endoplasmic reticulum:

✔ helps in the production and movement of materials

Golgi body:

✔ packages and distributes materials in and out of cell

mitochondrion:

✔ supplies energy that the cell uses

ribosome:

✔ produces proteins for the cell

Explanation:

took test :D

5 0
3 years ago
Read 2 more answers
Which particle is transferred from one object to another to create a static charge?
Snezhnost [94]
The answer is Electron


Hope this helped!!! :)

3 0
3 years ago
What is the first answer ?
QveST [7]

Answer:

d....

Explanation:

yes its d

sorry

7 0
2 years ago
Acids are and can destroy your skin and bones
sleet_krkn [62]

Answer:

This is true.

Explanation:

5 0
2 years ago
Other questions:
  • How many moles of C2H2 are needed to react completely with 84.0 mol O2?
    8·2 answers
  • The half-life of cesium-137 is 30 years. Suppose we have a 40 mg sample. Exercise (a) Find the mass that remains after t years.
    13·1 answer
  • What is the unit for mass
    9·2 answers
  • An neutral atom has 40 protons and 10 neutrons what is the mass number
    9·2 answers
  • Its is the change in energyof a neutral atom when an electron to the atom to form negativeion, thus neutral atom gain electon.Wh
    5·1 answer
  • 28.0 g of N2 gas was found to occupy a volume of 8.44 L at a
    12·2 answers
  • What do I do if I like someone but they think your annoying
    10·1 answer
  • What is the product(s) of the reaction below?
    8·1 answer
  • How many moles of ammonia are produced by 5 moles of hydrogen.
    12·1 answer
  • HELP!!!
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!