Take about 1g solid NaCl in a clean anddry test tube and set up the apparatus asshown in Fig. 2.4.n Add some concentrated sulphuric acid tothe test tube.n What do you observe? Is there a gas comingout of the delivery tube?
Question
Take about 1g solid NaCl in a clean anddry test tube and set up the apparatus asshown in Fig. 2.4.n Add some concentrated sulphuric acid tothe test tube.n What do you observe? Is there a gas comingout of the delivery tube?
Solution
When you add concentrated sulphuric acid to the test tube containing about 1g of solid NaCl, a reaction occurs. This reaction produces hydrogen chloride (HCl) gas.
Here's the chemical reaction: 2NaCl(s) + H2SO4(l) → Na2SO4(s) + 2HCl(g)
You will observe that the mixture in the test tube will start to effervesce or bubble, indicating that a gas is being produced. This gas will then travel out of the delivery tube.
To confirm that the gas is indeed hydrogen chloride, you can perform a simple test. Place a piece of litmus paper at the end of the delivery tube. If it turns red, it confirms the presence of hydrogen chloride gas, as this gas is acidic in nature.
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