9. titrations

Question 1

titration allow you to find out

Answer 1

how much acid is needed to neutralise a quantity of alkli

Question 2

how to carry out titration

Answer 2

1. measure out alkali using pipette. put in flask with appropriate indicator.
2. rough titration to give idea of end point
3. now do accurate titration. run acid in within 2cm3 of end point then add acid dropwise
4. work out amount of acid used to neutralise alkali (final reading - initial reading. (known as titre)

Question 3

titre readings need to be within

Answer 3

0.1cm3 of eachothe. other results=anomalous

Question 4

use a ___ to measure alkali

Answer 4

pipette

Question 5

use a ____ to add acid to alkali

Answer 5

burette

Question 6

what kind of flask is used

Answer 6

conical flask

Question 7

when taking reading from burette should read from

Answer 7

bottom of meniscus

Question 8

to make readings more accurate

Answer 8

take readings to nearest 0.05cm3

Question 9

main two indicators

Answer 9

methyl orange

phenolphthalein

Question 10

methyl orange colour change

Answer 10

yellow to red

Question 11

phenolphthalein colour change

Answer 11

pink to colourless

Question 12

how to make a standard solution

Answer 12

1. using a balance weigh required amount of solid onto a watch glass
2. transfer solid to beaker. use water to wash any bits of solid from watch glass.
3. add water to beaker to completely dissolve solid. use glass rod to stir helping it to dissolve.
4. once dissolved transfer to volumetric flask. rinse beaker and glass rod with water add to volumetric flask.
5. use water to fill volumetric flask up to graduation line. use pipette to dd final few drops.
6. put lid onto flask and shake to mix solution

Question 13

formula to find moles in solution

Answer 13

n= conc x volume(cm3) / 1000
OR
n= conc x volume (dm3)

Question 14

concentration/volume/moles triangle

Answer 14

………..n

Conc | volume (if vol cm3 / 1000)

Question 15

how many 1cm3 in 1dm3

Answer 15

1000cm3