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
Naily [24]
2 years ago
13

Amphetamine (C9H13N)(C9H13N) is a weak base with a pKbpKb of 4.2. You may want to reference (Pages 710 - 713) Section 16.8 while

completing this problem. Part A Calculate the pHpH of a solution containing an amphetamine concentration of 205 mg/Lmg/L. Express your answer to two d
Chemistry
1 answer:
Soloha48 [4]2 years ago
5 0

Answer:

pH = 10.38

Explanation:

  • C9H13N ↔ C9H20O3N+  +  OH-

∴ molar mass C9H13N = 135.21 g/mol

∴ pKb = - log Kb = 4.2

⇒ Kb = 6.309 E-5 = [OH-][C9H20O3N+] / [C9H13N]

∴ <em>C</em> sln = (205 mg/L )*(g/1000 mg)*(mol/135.21 g) = 1.516 E-3 M

mass balance:

⇒ <em>C</em> sln = 1.516 E-3 = [C9H20O3N+] + [C9H13N]......(1)

charge balance:

⇒ [C9H20O3N+] + [H3O+] = [OH-]; [H3O+] is neglected, come from water

⇒ [C9H20O3N+] = [OH-].......(2)

(2) in (1):

⇒ [C9H13N] = 1.516 E-3 - [OH-]

replacing in Kb:

⇒ Kb = 6.3096 E-5 = [OH-]² / (1.516 E-3 - [OH-])

⇒ [OH-]² + 6.3096 E-5[OH] - 7.26613 E-8 = 0

⇒ [OH-] = 2.3985 E-4 M

∴ pOH = - Log [OH-]

⇒ pOH = 3.62

⇒ pH = 14 - pOH = 14 - 3.62 = 10.38

You might be interested in
Chemist lectures about the following definition for acids and bases.
Brut [27]

Answer:

The correct answer is "the Lewis concept of acids and bases".

6 0
3 years ago
Which element has chemical properties similar to calcium?
Nataly_w [17]

Answer:

Sulfer

Explanation:

We just took the lesson lol

5 0
2 years ago
Read 2 more answers
Which atomic orbitals overlap to form the C-O bond of dimethyl ether, (CH3)20? O c 2sp^3 + 2sp^3 OC 2sp^2 + 0 2p O c 2sp^2 + 0 2
Mumz [18]

Answer:

C 2sp³ + 2sp³ O

Explanation:

Carbon has an atomic number equal to <em>6</em>, so its electronic distribution is:

1s²2s²2p²

Oxygen has an atomic number equal to <em>8</em>, so its electronic distribution is:

1s²2s²2p⁴

In dimethyl ether, the bonds between carbon and hydrogen and carbon and oxygen are saturated, so there will be only sigma bonds. The sigma bonds occurs in hybrids orbitals, and pi bonds on normal orbitals. So, the carbons and the oxygen of that compound has hybridization

2sp³, because they need 4 hybrid orbitals.

So the bond C-O occurs between C 2sp³ + 2sp³ O

4 0
3 years ago
Describe, in your own words, why stirring a pitcher of lemonade will help the lemonade powder dissolve faster. Be specific in yo
Leno4ka [110]
In order for a solute to dissolve it needs to fit in between the molecules of the solvent. When you stir the mixture it makes all the molecules move around making it more likely for the solute to find one of the gaps in the solvent needed to dissolve. In the case of lemonade, sugar is the solute and water is the solvent.
5 0
2 years ago
Which condition is necessary for a mold fossil to form? The fossil must be preserved in amber. Minerals must replace the remains
JulijaS [17]

Answer:

Hard parts of the organism must dissolve

Explanation:

I just took the quiz/test and got it right

7 0
3 years ago
Read 2 more answers
Other questions:
  • An element has the electronic configuration 1s22s22p63s23p63d104s24p65s2. identify the element.
    6·1 answer
  • Calculate the ratio of effusion rates of cl2 to f2 .
    14·1 answer
  • Periodic Table High School Reference Sheet
    8·1 answer
  • What is the ph of a 0.001 62 m naoh solution?
    12·1 answer
  • Which phrase describes the purpose of today’s wind farms ?
    11·1 answer
  • When the products of a reaction are hotter than the reactants:
    15·1 answer
  • Consider the equilibrium reaction. 4A+B↽−−⇀3C After multiplying the reaction by a factor of 2, what is the new equilibrium equat
    10·1 answer
  • Which technique would be best for separating sand and water?
    12·1 answer
  • How much heat is needed to boil 3,000 mL of water at its boiling point, 100 C?
    7·1 answer
  • The solubility of gases in liquids The solubility of gases in liquids increases as temperature increases and increases as pressu
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!