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The equipment shown is set up - HSC - SSCE Chemistry - Question 28 - 2015 - Paper 1
Question 28
The equipment shown is set up. After some time a ring of white powder is seen to form on the inside of the glass tube. Cotton wool soaked in concentrated hydrochlor... show full transcript
Worked Solution & Example Answer:The equipment shown is set up - HSC - SSCE Chemistry - Question 28 - 2015 - Paper 1
Step 1
Why would this NOT be an acid–base reaction according to Arrhenius?
Answer
According to Arrhenius' theory, an acid is a substance that increases the concentration of hydrogen ions (H⁺) in aqueous solution, while a base increases the concentration of hydroxide ions (OH⁻). In this setup, both hydrochloric acid and ammonia are in gaseous form rather than aqueous. Therefore, the reaction does not meet the criteria of an Arrhenius acid-base reaction, as it does not occur in an aqueous solution.
Step 2
Explain why this would be considered a Brønsted–Lowry acid–base reaction. Include an equation in your answer.
Answer
This reaction can be classified as a Brønsted–Lowry acid-base reaction because it involves the transfer of protons (H⁺ ions). In this case, hydrochloric acid (HCl) acts as a proton donor (acid), while ammonia (NH₃) acts as a proton acceptor (base). The reaction can be represented by the following equation: