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
r-ruslan [8.4K]
3 years ago
11

Science

Chemistry
1 answer:
Ivan3 years ago
5 0
B. attempts to answer questions we have based on our observations
You might be interested in
CH3COOH  CH3COO– + H+
Oxana [17]

(a)

pH = 4.77

; (b)

[

H

3

O

+

]

=

1.00

×

10

-4

l

mol/dm

3

; (c)

[

A

-

]

=

0.16 mol⋅dm

-3

Explanation:

(a) pH of aspirin solution

Let's write the chemical equation as

m

m

m

m

m

m

m

m

l

HA

m

+

m

H

2

O

⇌

H

3

O

+

m

+

m

l

A

-

I/mol⋅dm

-3

:

m

m

0.05

m

m

m

m

m

m

m

m

l

0

m

m

m

m

m

l

l

0

C/mol⋅dm

-3

:

m

m

l

-

x

m

m

m

m

m

m

m

m

+

x

m

l

m

m

m

l

+

x

E/mol⋅dm

-3

:

m

0.05 -

l

x

m

m

m

m

m

m

m

l

x

m

m

x

m

m

m

x

K

a

=

[

H

3

O

+

]

[

A

-

]

[

HA

]

=

x

2

0.05 -

l

x

=

3.27

×

10

-4

Check for negligibility

0.05

3.27

×

10

-4

=

153

<

400

∴

x

is not less than 5 % of the initial concentration of

[

HA

]

.

We cannot ignore it in comparison with 0.05, so we must solve a quadratic.

Then

x

2

0.05

−

x

=

3.27

×

10

-4

x

2

=

3.27

×

10

-4

(

0.05

−

x

)

=

1.635

×

10

-5

−

3.27

×

10

-4

x

x

2

+

3.27

×

10

-4

x

−

1.635

×

10

-5

=

0

x

=

1.68

×

10

-5

[

H

3

O

+

]

=

x

l

mol/L

=

1.68

×

10

-5

l

mol/L

pH

=

-log

[

H

3

O

+

]

=

-log

(

1.68

×

10

-5

)

=

4.77

(b)

[

H

3

O

+

]

at pH 4

[

H

3

O

+

]

=

10

-pH

l

mol/L

=

1.00

×

10

-4

l

mol/L

(c) Concentration of

A

-

in the buffer

We can now use the Henderson-Hasselbalch equation to calculate the

[

A

-

]

.

pH

=

p

K

a

+

log

(

[

A

-

]

[

HA

]

)

4.00

=

−

log

(

3.27

×

10

-4

)

+

log

(

[

A

-

]

0.05

)

=

3.49

+

log

(

[

A

-

]

0.05

)

log

(

[

A

-

]

0.05

)

=

4.00 - 3.49

=

0.51

[

A

-

]

0.05

=

10

0.51

=

3.24

[

A

-

]

=

0.05

×

3.24

=

0.16

The concentration of

A

-

in the buffer is 0.16 mol/L.

hope this helps :)

6 0
2 years ago
30) When ionic bonds are formed, metallic atoms tend to
Strike441 [17]

Answer:

B is the answer

Explanation:

7 0
3 years ago
In a chemical equation, the arrow always points toward what?
blondinia [14]
It always points towards the products.
7 0
3 years ago
Plzzzzzzzzzzzzzzzzzzzzzzzz help ​
AfilCa [17]

Gases, bc its expand the most upon heating because the intermolecular space is more than in solids or liquids.

intermolecular space = the space between each particles

8 0
3 years ago
Read 2 more answers
Can I get help in #6 ?
Otrada [13]

option A Hydrogen will have the greatest rate of effusion beacuse it has the least mass among all

6 0
2 years ago
Other questions:
  • Define the term ionization energy. Choose one:
    11·1 answer
  • PLEASE HELP MEEE!!! A group of students performed an experiment in which they dropped a cube of metal into a graduated cylinder
    11·1 answer
  • Which determines the frequency of a sound wave? A the intensity of the sound waves B the rate at which the sound source is vibra
    15·2 answers
  • How many boxes of B would be required to make 30 grams of C?
    10·1 answer
  • If your density was supposed to be 2.3 g/mL, but you calculated yours to be 2.1 g/mL, what is your percent error?
    8·1 answer
  • Why is water in the gas phase when it comes out of a volcano?
    7·2 answers
  • Explain why bond angle of H2O is greater than OF2
    7·1 answer
  • Who placed all the elements in the right place according to their properties
    11·1 answer
  • water is set on the stove to boil as it absorbs the temperature increases from 27.5°C to 56.0°C. if there was 325g of water adde
    5·1 answer
  • If the map shows the average high temperature in July for two cities in Texas. like Del Rio=36°c
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!