Chemistry Q1c – Glossary | HSC HSC Practice – StudyPulse
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Chemistry HSC HSC Practice Question 1c – Glossary

Q1c Chemistry Glossary Module 8 - Outcome 3

A regional hospital is considering switching from a conventional disinfectant (Disinfectant A) to a newly designed disinfectant (Disinfectant B) intended to reduce environmental impact while maintaining effectiveness.

Both products are supplied as concentrated liquids and diluted with water before use.

Key information provided by the manufacturers:

  • Disinfectant A contains 10.0% \(m/m\) of the active ingredient Q. Q is effective but is classified as toxic to aquatic life and is not readily biodegradable.
  • Disinfectant B contains 4.00% \(m/m\) of the active ingredient R. R is designed to hydrolyse in water to form two products: a weak organic acid (HA) and an alcohol (ROH). The manufacturer claims these hydrolysis products are readily biodegradable.
  • The hospital uses 250 L per day of working disinfectant solution.
  • For Disinfectant A, the working solution is prepared by diluting the concentrate by a factor of 200.
  • For Disinfectant B, the working solution is prepared by diluting the concentrate by a factor of 80.
  • Densities (assume constant):
  • Disinfectant A concentrate: 1.10 g mL\(^{-1}\)
  • Disinfectant B concentrate: 1.02 g mL\(^{-1}\)
  • Molar masses:
  • \(M(Q) = 200.0\) g mol\(^{-1}\)
  • \(M(R) = 160.0\) g mol\(^{-1}\)
  • Hydrolysis of R in water occurs as: \$\(R + H_2O \rightarrow HA + ROH\)\$
    (1:1 stoichiometry for formation of HA)

A local river receives treated wastewater from the hospital. The wastewater treatment plant reports that, on average, only 70% of Q is removed during treatment, while 95% of R is removed (through hydrolysis and biodegradation) before discharge. The remaining fraction is released to the river.

Question 1c

3 marks

Assuming any R that is not removed undergoes hydrolysis in the river, calculate the amount (in moles) of HA formed per day from the discharged R.

Your Answer

0 words

About This Chemistry Question

This is a free HSC HSC Chemistry practice question worth 3 marks, testing your understanding of Glossary. It falls under Chemical Synthesis and Design in Module 8: Module 8: Applying Chemical Ideas. Submit your answer above to receive instant AI-powered marking and personalised feedback.

Subject
Chemistry – Higher School Certificate (NSW) HSC
Module 8
Module 8: Applying Chemical Ideas
Outcome 3
Chemical Synthesis and Design
Content Point
Glossary

Module 8 Overview

The identification and analysis of chemicals is of immense importance in scientific research, medicine, environmental management, quality control, mining and many other fields. Students investigate a range of methods used to identify and measure quantities of chemicals. They investigate and process data involving the identification and quantification of ions present in aqueous solutions. This is particularly important because of the impact of adverse water quality on the environment. Students deduce or confirm the structure and identity of organic compounds by interpreting data from qualitative tests of chemical reactivity and determining structural information using proton and carbon-13 nuclear magnetic resonance (NMR) spectroscopy.

Chemical Synthesis and Design

Inquiry question: What are the implications for society of chemical synthesis and design?

Content Point Detail

Glossary

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