CBSE Class 10 Science 2017 · Paper 31/1/C · Question 34
If you add a few drops of acetic acid to a test tube containing
- (i)distillated water and
- (ii)aqueous solution of sodium hydrogen carbonate, what would you observe ? If a reaction takes place in any one of the above two cases, list its two observations.
Answer
No reaction with distilled water; with sodium hydrogen carbonate there is brisk effervescence of carbon dioxide, which turns lime water milky.
(i) With distilled water: the acetic acid dissolves completely, giving a clear, colourless solution; there is no effervescence and no visible reaction.
(ii) With sodium hydrogen carbonate solution a reaction takes place: . Its two observations: brisk effervescence, as bubbles of a colourless, odourless gas are given off; and the gas turns lime water milky, showing that it is carbon dioxide.
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