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Stoichiometric Calculations

A sample of h...

Question

A sample of hard water from some source was found to release carbon dioxide gas when boiled. It is possible to titrate the sample of water from the same source with ?

A

dil HCl

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B

dil NaOH

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C

Neither (a) nor (b)

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D

A good reducing agent such as sodium metal

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Solution

The correct options are
A
dil HCl

B
dil NaOH

The hard water sample contains $H C O_{3}^{-}$ ion and can be titrated with dil HCl as also with dil NaOH.
$H C O_{3}^{-} + H C l \to H_{2} O + C O_{2} + C l^{-}$
$H C O_{3}^{-} + N a O H \to N a^{+} + C O_{3}^{2 -} + H_{2} O$

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