A student investigates the acidity of a common household cleaning product labelled “descaler” (used to remove limescale from kettles and coffee machines). The label states: “Contains an organic acid. Do not ingest. Avoid contact with eyes.”
The student dilutes 10.00 mL of the descaler to 250.0 mL in a volumetric flask (Solution D). They then pipette 25.00 mL of Solution D into a conical flask and titrate it with 0.1000 mol L\(^{-1}\) sodium hydroxide solution.
The student records three concordant titres: 18.62 mL, 18.58 mL and 18.60 mL.
Assume the organic acid behaves as a monoprotic acid, HA, and that the reaction with sodium hydroxide goes to completion.
Relevant information:
Use the titre data to calculate the concentration of HA in Solution D. Show your working and use an appropriate average titre.
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Create Free Account Log inThis is a free HSC HSC Chemistry practice question worth 4 marks, testing your understanding of Dissociation constant and acid strength. It falls under Quantitative Analysis 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: How are solutions of acids and bases analysed?
calculate and apply the dissociation constant (Kd) and pKd (pKd = -log10 (Kd)) to determine the difference between strong and weak acids (ACSCH098)
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