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Standard XII
Chemistry
Types of Unit Cell
What is the f...
Question
What is the formula for calcium hydroxide?
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Solution
To make a neutral species, we simply balance the charges.
To balance the charge of the metal ion,
C
a
2
+
we need 2 hydroxide ions
2
×
O
H
−
We get the formula
C
a
(
O
H
)
2
Note that once you know the formula for calcium hydroxide, you know the formula for the hydroxides of ALL the Group 2 metals, i.e.
B
a
(
O
H
)
2
,
S
r
(
O
H
)
2
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