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Volumetric Analysis2

Volumetric Analysis: Oxidation-Reduction

QuestionAnswer
Why is our main Oxidising Agent Potassium Permanganate not considered a primary standard? It cannot be found in a pure enough state and decomposed in sunlight
Opposing reducing agent used for Potassium Permanganate? Sulphuric Acid
Why can we not use Hydrochloric Acid or Nitric Acid in our experiments with Potassium Permanganate? They are oxidising agents, not reducing agents!
Indicator used with Potassium Permanganate? Colour change? Potassium Permanganate is its own indicator. It goes from purple to colourless.
Besides being our reducing agent there is a second reason for adding Sulphuric acid to this titration involving Potassium Permanganate. What is it? Potassium Permanganate will only change colour in an acidic solution, it will not work in a neutral or basic environent.
Why is Iron Sulphate not considered a primary standard? It is oxidised in air and reacts with water (hydrolysis)
What compound provides us with a pure source of Iron Sulphate? Ammonium Iron (II) Sulphate
How do we prevent the Ammonium Iron (II) Sulphate from reacting with the water when dissolved? Addition of Sulphuric Acid supplies H+ ions to the solution which prevents Hydrolysis.
What is the ration between Fe+2 ions and Potassium Permanganate 1:5
What illness is caused by lack or Iron in our diet? Anaemia
What is the function of iron in our diet? It is an essential part of haemoglobin, the molecule that carries oxygen in our blood.
Symptoms of anaemia? Fatigue, weakness and pale skin
One use of sodium thiosulphate in industry? Used in the development of photographs.
Why is Sodium Thiosulphate not considered a primary standard? It is not found in a 100% pure state
Why is Iodine not considered a primary standard? How do we supply pure Iodine to our titrations? Iodine sublimes at room temperature. Excess Iodine is supplied by the addition of Potassium Iodide.
What indicator is used when titrating Potassium Permanganate and Sodium Thiosulphate? When is the indicator added? Starch indicator added. It is added when a straw yellow colour appears. We continue the titration until the colour changes from blue/black to colourless.
What colour appears when the Potassium Permanganate and Potassium Iodide are mixed together. What causes this colour? Purple to red-brown as pure Iodine is released from the Potassium Iodide
Why is the bleach solution diluted with water? The bleach is a concentrated solution which would require too much reagents for the titration
Created by: cbschemistry
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