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Question
Chemistry
What will be the pH of a solution formed by mixing 40 cm3 of 0.1 M HCl with 10 cm3 of 0.45 M NaOH?
Q. What will be the pH of a solution formed by mixing 40
c
m
3
of 0.1 M HCl with 10
c
m
3
of 0.45 M NaOH?
452
145
NTA Abhyas
NTA Abhyas 2022
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A
10
B
8
C
5
D
12
Solution:
Number of moles of HCl
=
1000
M
V
=
1000
0.1
×
40
=
0.004
Number of moles of NaOH
=
1000
M
V
=
1000
0.45
×
10
=
0.0045
Remaining moles of NaOH after neutralization = 0.0045 – 0.004 = 0.0005
Molarity of
O
H
−
=
50
0.0005
×
1000
=
0.01
M
So pOH
=
2
So pH = 14 – 2 = 12