Chemistry Sheet Strong And Weak Bases
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1C h e m g u i d e – q u e s t i o n s
STRONG AND WEAK BASES
1. Use sodium hydroxide and ammonia to help you to explain what is meant by a strong base and a
weak base.
2. Work out the pHs of the following solutions of strong bases. K
= 1.00 x 10
-14
mol
2
dm
-6
W
a) 0.200 mol dm
-3
sodium hydroxide solution
-3
b) 0.0100 mol dm
potassium hydroxide solution
-3
c) 0.0200 mol dm
calcium hydroxide solution
3. Don't bother with this question unless you need to know about K
and pK
.
b
b
a) Write an equation showing the equilibrium which occurs when ammonia dissolves in water.
b) Write an expression for K
for ammonia.
b
c) Define pK
.
b
d) The value for K
for methylamine, CH
NH
, is 4.37 x 10
-4
mol dm
-3
. What is the value of pK
?
b
3
2
b
e) Two bases have the following values for K
:
b
base A: 4.17 x 10
-10
mol dm
-3
base B: 5.37 x 10
-4
mol dm
-3
Which is the stronger base?
f) Two different bases have the following values for pK
:
b
base C: 4.75
base D: 3.27
Which is the stronger base?
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