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A white solid is either Na(2)O or Na(2)O...

A white solid is either `Na_(2)O` or `Na_(2)O_(2)`. A piece of red litmus paper turns white when it is dipped into a freshly made aqueous solution
of the white solid.
a. Identify the substance and explain the balanced equation.
b. Explain what would happen to the red litmus if the white solid
were the other compound.

Text Solution

Verified by Experts

a. `Na_(2)O` and `Na_(2)O_(2)`, when dissolved in water give `Na_(2)O+H_(2O rarr 2NaOh`
`Na_(2)O_(2)+2H_(2)O rarr 2NaOH+H_(2)O_(2)`
A piece of litmus paper truns white when it is dipped into a freshyl made aqueous solution of compoud (A), due to bleaching action of `H_(2)O_(2)`, thus compound (A) is `Na_(2)O_(2)`, i.e., sodium peroxide.
b. If white solid was `Na_(2)O`, the red litmus paper will trun blue due to the strong alkaline nature of the solution. `Na_(2)O+H_(2)O rarr 2NaOH`
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