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NSWChemistryQuick questions
Module 6: Acid/Base Reactions
Quick questions on Properties of acids and bases (Arrhenius model) explained: HSC Chemistry Module 6
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are indicators?Show answer
An indicator is a weak acid or weak base whose protonated and deprotonated forms have different colours. The colour change occurs across a narrow pH range, usually about 2 pH units wide.
What is the Arrhenius model?Show answer
Svante Arrhenius (1887) proposed that acids and bases are substances that ionise in water.
What is limitations of the Arrhenius model?Show answer
Arrhenius works well for simple aqueous acid-base reactions, but it cannot explain:
What is q1?Show answer
List four observable properties of acids and four of bases, and state how the Arrhenius model accounts for each. [4 marks]
What is q2?Show answer
Calculate the pH of a 0.0250 mol L solution of , a strong diprotic base. [3 marks]
What is q3?Show answer
Discuss the limitations of the Arrhenius model. (a) State one species that is basic but contains no hydroxide. (b) Identify one solvent in which Arrhenius theory does not apply.
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