cloth strip dipped in onion juice is used for testing a liq
liquid Xchanges its odour. Which type of an indicator is onion juice?
The liquid X' turns blue litmus red. List the observations the liquid
will show on reacting with the following:
(a)
(b)
Zinc granules
Solid sodium carbonate
Write the chemical equations for the reactions involved.
Answers
The substance 'X' is Hydrochloric Acid (HCL)
Onion is an example of Olfactory indicator
(a) When Zinc granules is added to HCl, the zinc displaces hydrogen and form Zinc Chloride along with release of hydrogen gas
Zn + 2HCL => ZnCl₂ + H₂
(b) When solid sodium carbonate is added to HCl, the products formed are Sodium chloride, along with Carbon dioxide and water.
Na₂CO₃ + 2HCL => 2NaCl + CO₂ + H₂O
Answer:
zinc granules and solid sodium carbonates
Explanation:
Onion juice is an olfactory indicator.
(a) zinc granules Reaction : Ent 2HCl → 2h Cd at Hz
observation : when a burnt match stick is brought close to the
mouth of the test tube , gas burns with pop sound.
9 Solid sodium carbonate
Reaction : NobelOz t 2h Cd → 2NaCl t Hot CO2
observation : coz that is released turns lime water Milky.