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Some Basic Concepts Of Chemistry

Question
CBSEENCH11005059

Balance the following equations:
1. space space space straight H subscript 3 PO subscript 3 space space space rightwards arrow space space space space straight H subscript 3 PO subscript 4 plus PH subscript 3
2. space space space Ca plus straight H subscript 2 straight O space space rightwards arrow space space Ca left parenthesis OH right parenthesis subscript 2 plus straight H subscript 2

Solution
1. space straight H subscript 3 PO subscript 3 space space rightwards arrow space space space straight H subscript 3 PO subscript 4 plus PH subscript 3
P occurs at maximum places and should be balanced last of all.
(i) To balance O atom, multiply H3PO4 by 4 and H3PO4 by 3.
4 straight H subscript 3 PO subscript 3 space rightwards arrow space space space space 3 straight H subscript 3 PO subscript 4 plus PH subscript 3
(ii) P and H atoms are automatically balanced.
therefore space space space space Balanced space equation space is
space space space space space space space space space space space space space space space 4 straight H subscript 3 PO subscript 3 space space space rightwards arrow space space space space 3 straight H subscript 3 PO subscript 4 plus PH subscript 3
2. space Ca plus straight H subscript 2 straight O space rightwards arrow space Ca left parenthesis OH right parenthesis subscript 2 plus straight H subscript 2
left parenthesis straight i right parenthesis space To space balance space straight O space atoms comma space multiply space straight H subscript 2 straight O space by space 2.
space space space space Ca plus 2 straight H subscript 2 straight O space space space rightwards arrow space space space Ca left parenthesis OH right parenthesis subscript 2 plus straight H subscript 2
left parenthesis ii right parenthesis space Ca space and space straight H space are space automatically space balanced.
therefore space space space Balanced space equation space is
space space space space space space Ca plus 2 straight H subscript 2 straight O space space rightwards arrow space space space Ca left parenthesis OH right parenthesis subscript 2 plus straight H subscript 2