PS 1 - aaaaaaaa PDF

Title	PS 1 - aaaaaaaa
Author	Jon goodmna
Course	Physiology
Institution	Al-Quds University
Pages	2
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Chem 231

PS 1.2 Acid/base Reactions

page 1

NAME _________________________________ 1. Since water is amphoteric, it may behave as an acid or as a base. Therefore, H2O has a conjugate base called hydroxide ion and water has a conjugate acid called the hydronium ion:

OH conj. base

H2 O

H3 O conj. acid

Ammonia is also amphoteric. Write the formula for the conjugate acid and the conjugate base for NH3. Be sure to include formal charges for each conjugate, if any.

NH3

conj. base

conj. acid

2. Draw the structure of the product from these reactions. a. CH3OH + NaH 

OH

+

b.

KH

OH CH3

c. CH3

+

NaOH

+

H2SO4

OH

d. CH3

CH3

3. What is the general name for the oxygen ion formed when an alcohol is treated with a strong base? ___________________________________

4. What is the general name for the oxygen ion formed when an alcohol is treated with a strong acid? ____________________________________

Chem 231

PS 1.2 Acid/base Reactions

page 2

NAME _________________________________ 5. Identify each species in the reaction as stronger acid, weaker acid, stronger base, weaker base (SA, WA, SB, WB) to determine whether equilibrium favors the products or reactants. Remember, the stronger acid produces the weaker conjugate base. Some pKa values are given. The first reaction is completed as an example. ethane thiol CH3CH2SH

pKa = 10.5

ammonium ion NH4+

pKa = 9.5

chloroacetic acid Cl-CH2CO2H

pKa = 2.8

hydrogen H2

pKa = 35

ethanol CH3CH2OH

pKa = 16.2

methane CH4

pKa = 50

methanol CH3OH

pKa = 16

phenol (C6H5OH)

pKa = 10.0

propyne

H3C

C

C

H

pKa = 25 circle your choice for each reaction

OH

O

(a)

NH4

+

+

pKa = 9.5

NH3

products or reactants

pKa = 10

SA

SB

WA

WB O

O

(b)

Cl

CH2

C

OH

NH3

+

(d)

(e)

(f)

CH3CH2OH

+

CH3CH2SH

+

H3C C C

H3C C C H

+

+ CH3CH2O

NaH

C

O

prod. or react.

OH

O

(c)

Cl CH2

+

NH4

CH3CH2S

+

H2

prod. or react.

prod. or react.

CH4

H3C C C H

+

CH3Li

prod. or react.

+ CH3O

H3C C C

+

CH3OH

prod. or react....