Chemistry
Given below are four different illustrations of preparing hydrochloric acid drawn by students. Which of these is the correct?
Hydrogen Chloride
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Answer
Reason — The inverted funnel is placed so that its rim just touches the water surface in the beaker. This setup is important for two main reasons:
- To prevent back-suction of water:
If the funnel mouth were dipped too deep into the water, a sudden cooling or stopping of gas flow could create a partial vacuum and suck water back into the gas supply tube. Keeping the rim just touching the water avoids this backward flow of water. - To increase the surface area for absorption:
The wide mouth of the funnel spreads the hydrogen chloride gas over a larger area of water. This helps the gas dissolve faster and more efficiently, since hydrochloric acid is prepared by dissolving hydrogen chloride gas in water.
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