A student investigates acid-base behaviour in water and in a non-aqueous solvent. Four separate beakers are prepared at \(25^\circ\text{C}\).
The student records that electrical conductivity increases strongly in Beaker 1 and Beaker 2, but only weakly in Beaker 3 and Beaker 4. The student also notes that in ethanol, neither solute produces a large concentration of \(\text{H}_3\text{O}^+\).
Using Brønsted-Lowry theory, write an equation to show the acid-base reaction that best explains the strong conductivity in Beaker 1 and Beaker 2. Identify the conjugate acid-base pair(s) present in each beaker.
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Create Free Account Log inThis is a free HSC HSC Chemistry practice question worth 6 marks, testing your understanding of Explore the changes in definitions and models. It falls under Properties of Acids and Bases in Module 6: Module 6: Acid/Base Reactions. Submit your answer above to receive instant AI-powered marking and personalised feedback.
Students analyse how and why the definitions of both an acid and a base have changed over time, and how the current definitions characterise the many chemical reactions of acids. Acids react in particular ways to a variety of substances. These reactions follow a pattern that students identify and explore in detail. Acids and bases, and their reactions, are used extensively in everyday life and in the human body. The chemistry of acids and bases contributes to industrial contexts and the environment. Therefore, it is essential that the degree of acidity in these situations is continually monitored. By investigating the qualitative and quantitative properties of acids and bases, students learn to appreciate the importance of factors such as pH and indicators.
Inquiry question: What is an acid and what is a base?
explore the changes in definitions and models of an acid and a base over time to explain the limitations of each model, including but not limited to: - Arrhenius’ theory - Brønsted–Lowry theory (ACSCH064, ACSCH067)
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