Write the experiment when HCL reacts with zn pieces and liberates H2 gas ?
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Answer:
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Answer:
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THEORY
Chemical species which donate proton or release H+ ions when dissolved in water are called acid. They turn blue litmus solution to red colour.
Hydrochloric acid reacts with zinc metal to produce zinc chloride and hydrogen gas. The reaction is given below:
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
Hydrochloric acid reacts with Na2CO3 to produce carbon dioxide and turns the lime water milky as it forms calcium carbonate. The milkiness formed is disappeared when more than necessary carbon dioxide is passed through the solution. The reaction is as follows:
Na2CO3(s/aq) + 2HCl(aq) → 2NaCl(aq) + H2O(l) + CO2(g)
Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
CaCO3(s) + H2O(l) + CO2(g) → Ca(HCO3)2(aq)
Experimental Setup for Litmus Test Procedure
Take a test tube stand and place two test tubes in it.
Label the test tube as test tube 1 and test tube 2.
Add 5 ml of blue litmus solution to test tube 1.
Add 5 ml of red litmus solution to test tube 2.
Use a dropper and add equal drops of hydrochloric acid in the both test tubes.
Wait and observe the colour change.
Experimental Setup for Reaction with Zinc metal:
Take a clean and dry test tube.
Add zinc granules in it.
Submerge the zinc granules in the test tube by adding hydrochloric acid to it.
Close the mouth of the test tube with cork which has a glass delivery.
A robust explosion takes place between 2-3 minutes liberating colourless and odourless gas.
When a burning match stick in got near the glass tube mouth the gas burns with a pale blue flame with a pop sound.
Observation:
Litmus test The blue litmus solution in test tube 1 turns red whereas there is no change in colour observed in the test tube 2 containing red litmus solution' the test tube by placing your thumb on its mouth.