9.1 - Colorimetric Experiment to Estimate Free Chlorine in Swimming Pool Water or Bleach (Leaving Cert Chemistry): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What are the two forms of free chlorine mentioned in this experiment?
What are the two forms of free chlorine mentioned in this experiment?
and
What substance is released when chlorine reacts with potassium iodide?
What substance is released when chlorine reacts with potassium iodide?
Iodine ()
What wavelength filter is used in the colorimeter for this experiment?
What wavelength filter is used in the colorimeter for this experiment?
440 nm
Why is ethanoic acid used in this experiment?
Why is ethanoic acid used in this experiment?
To provide acidic conditions needed
What volume of Milton is added to the 250 cm³ volumetric flask initially?
What volume of Milton is added to the 250 cm³ volumetric flask initially?
2.5 cm³
How much diluted chlorine solution is added to flask D?
How much diluted chlorine solution is added to flask D?
4 cm³
How long must the solutions stand for colour development?
How long must the solutions stand for colour development?
5 minutes
What is used to zero the colorimeter before measuring absorbance?
What is used to zero the colorimeter before measuring absorbance?
Deionised water
What type of graph is plotted to determine chlorine concentration?
What type of graph is plotted to determine chlorine concentration?
Absorbance vs concentration
What factor is used to convert concentration to free chlorine concentration?
What factor is used to convert concentration to free chlorine concentration?
71/74.5
What hazard is associated with sodium hypochlorite in Milton?
What hazard is associated with sodium hypochlorite in Milton?
Corrosive and causes burns
What is an advantage of using a colorimeter for this determination?
What is an advantage of using a colorimeter for this determination?
Quick, accurate, efficient results