Quantative Chemistry Topic 4 Unit 2 Flashcards
What is the definition of concentration?
The concentration of a solution is a measure of how much of a substance is dissolved in a known amount of water
Concentration in g/dm3 =…..
Mass of solute (g) / volume (dm3)
What is the concentration in g/dm3 of 30g of Nacl dissolved in 3dm3 of solution
Concentration in g/dm3 = mass of solute (g) / volume (dm3)
30/3
10g/dm3
1 litre = …
1dm3
C in the formula c = n/v
Concentration
N in formula c = n/v
No. of moles
V in formula c = n/v
Volume
1dm3 = ……
1000cm3
What formula do you use to change from one unit to another?
Concentration in g/dm3 = concentration in moles / dm3 X RFM
Definition of titration
A method of reacting 2 solutions together to determine the number of moles of the solute in one of the solutions
How do you prepare a burette
Rinse with deionised water
Rinse with solution
Fill with solution
Allow solution to run out until bottom of meniscus is on the zero line
Ensure the tip is full and there are no air bubbles
How do you prepare a pipette
Rinse with deionised water
Using a pipetter filler: rinse with solution, fill with solution
Holding the pipette vertically with the volume line at eye level, run out the solution until the bottom of the meniscus is on the line
Colour of phenolphalein in acid
Colourless
Colour of methyl orange in acid
Red
Colour of methyl orange in alkali
Yellow