Ethylenediamine ( N H 2 C H 2 C H 2 N H 2 , abbreviated en) is an organic base that can accept two protons: e n ( a q ) + H 2 O ( 1 ) ⇌ e n H + ( a q ) + O H − ( a q ) K b l = 5.2 × 10 − 4 e n H + ( a q ) + H 2 O ( l ) ⇌ e n H 2 2 + ( a q ) + O H − ( a q ) K b 1 = 3.7 × 10 − 7 Consider the titration of 30.0 mI of 0.100 M ethylenediamine with 0.100 M HCI. Calculate the pH after the addition of the following volumes of acid, and construct a qualitative plot of pH versus milliliters of HCI added: (j) 0.0 mL (ii) 15.0 mL (iii) 30.0 mL (iv) 45.0 mL (v) 60.0 mL (vi) 75.0 mL Draw the structure of ethylenediamine, and explain why it can accept two protons. What hybrid orbital do the N atoms use for bonding?
Ethylenediamine ( N H 2 C H 2 C H 2 N H 2 , abbreviated en) is an organic base that can accept two protons: e n ( a q ) + H 2 O ( 1 ) ⇌ e n H + ( a q ) + O H − ( a q ) K b l = 5.2 × 10 − 4 e n H + ( a q ) + H 2 O ( l ) ⇌ e n H 2 2 + ( a q ) + O H − ( a q ) K b 1 = 3.7 × 10 − 7 Consider the titration of 30.0 mI of 0.100 M ethylenediamine with 0.100 M HCI. Calculate the pH after the addition of the following volumes of acid, and construct a qualitative plot of pH versus milliliters of HCI added: (j) 0.0 mL (ii) 15.0 mL (iii) 30.0 mL (iv) 45.0 mL (v) 60.0 mL (vi) 75.0 mL Draw the structure of ethylenediamine, and explain why it can accept two protons. What hybrid orbital do the N atoms use for bonding?
Solution Summary: The author explains how the pH after addition of each given volume of acid should be calculated and a qualitative plot of pH versus milliliters of HCl constructed.
Ethylenediamine (
N
H
2
C
H
2
C
H
2
N
H
2
, abbreviated en) is an organic base that can accept two protons:
e
n
(
a
q
)
+
H
2
O
(
1
)
⇌
e
n
H
+
(
a
q
)
+
O
H
−
(
a
q
)
K
b
l
=
5.2
×
10
−
4
e
n
H
+
(
a
q
)
+
H
2
O
(
l
)
⇌
e
n
H
2
2
+
(
a
q
)
+
O
H
−
(
a
q
)
K
b
1
=
3.7
×
10
−
7
Consider the titration of 30.0 mI of 0.100 M ethylenediamine with 0.100 M HCI. Calculate the pH after the addition of the following volumes of acid, and construct a qualitative plot of pH versus milliliters of HCI added:
(j) 0.0 mL (ii) 15.0 mL
(iii) 30.0 mL (iv) 45.0 mL
(v) 60.0 mL (vi) 75.0 mL
Draw the structure of ethylenediamine, and explain why it can accept two protons.
What hybrid orbital do the N atoms use for bonding?
Laminar compounds are characterized by havinga) a high value of the internal surface of the solid.b) a high adsorption potential.
Intercalation compounds have their sheetsa) negatively charged.b) positively charged.
Indicate whether the following two statements are correct or not:- Polythiazine, formed by N and S, does not conduct electricity- Carbon can have a specific surface area of 3000 m2/g
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