Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards




share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

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