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SingaporeChemistryQuick questions
Physical Chemistry
Quick questions on Ionic equilibria, pH, Ka and buffers: Singapore A-Level H2 Chemistry
5short 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 is bronsted-Lowry theory?Show answer
A Bronsted-Lowry acid is a proton () donor; a base is a proton acceptor. Each acid has a conjugate base (what remains after losing ), and each base has a conjugate acid:
What are buffers?Show answer
A buffer resists pH change on adding small amounts of acid or base. It is made from a weak acid and its conjugate base (an acidic buffer) or a weak base and its conjugate acid (a basic buffer). Its pH is given by:
What is q1?Show answer
Calculate the pH of mol dm nitric acid (a strong acid). [1 mark]
What is q2?Show answer
Calculate the pH of mol dm sodium hydroxide. [2 marks]
What is q3?Show answer
Explain why a mixture of ammonia and ammonium chloride acts as a buffer, with equations. [3 marks]
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