Chemical Analysis Flashcards
What is a standard solution
Solutions of which the concentration is accurately known
Redox titrations indicator and purpose
Use a redox indicator to detect the end-point of a reaction
Why is starch used as an indicator for iodine
It turns blue/black with any excess iodine, giving a clear end-point
Why use chromatography
To separate substances in complex mixtures
What can make a difference to how a sample travels
Size/gfm
Polarity of molecules
What does a disclosing agent do for amino acids
Causes amino acids to show as coloured spots
Amino acid colour
Colourless
What is the mobile phase in GLC
Inert gas
What is the stationary phase in GLC
Thin layer of a high bpt inert liquid absorbed onto an inert solid support
What is retention time
The amount of time that a substance takes to pass through the column
What does peak height mean
How much of the compound is present
What does a high/large peak mean
More of the compound is present
Example of a disclosing agent
Ninhydrin
How to make titrations more accurate
White tile under the flask
Swirl the flask consistently
Best equipment to use for small measurements (50cm3)
Burette
