Making Salts (48-50) (paper 2) Flashcards
1
Q
what are the three type of salt practicles
A
- titration
- precipitation reaction
- excess solid
2
Q
when would you use a titration
A
- to find out concerntration
- to make a salt from an acid and alkali
3
Q
decribe a titration method
A
- pipette alkali solution into a cronical flask
- add a few drops of phenolphthalein indicator
- put acid into the burette
- add acid to alakli with swirling motion until indicator changes from pink to colourless
- record your burette volume and repeat until concordent results are achieved
4
Q
could you make pure salt crystals from a titration
A
no - you would have to repeat without the indicator and heat solution to crystalisation point, filter, wash and dry
5
Q
how many decimal place values do titration results have
A
2 eg. 19.50
6
Q
what is the range for a concordent result
A
plus or minus 0.1cm^2
7
Q
define percipitate
A
an insoluble salt made from two solutions
8
Q
describe the method to make an insoluble salt from two solutions
A
- mix lead nitrate and magnesium sulfate (dissolved in water) together
- lead sulfate (percipitate) forms (insoluble salt)
- filter out (lead sulfate) the percipitate
- wash with distilled water
- leave to dry in a warm oven
9
Q
given its another way of making salt but in paper 1 as well: describe the method for an excess solid method
A
- heat the sulfuric acid
- add balck copper oxide powder to excess and stir
- filter out excess copper ocide powder
- heat blue copper sulfate solution until crystalisation point and leave to cool
- filter out the crystals and wash with distilled water
- leave to dry or between filter paper
