Topic B1 - Moles, formulae & equations

Question 1

What 3 things can a titration be used for?

Answer 1

-finding the conc. of a solution
-identifying an unknown chemical
-finding the purity of a substance

Question 2

What is a standard solution?

Answer 2

a solution of a known concentration

Question 3

What apparatus do you use to make a standard solution?

Answer 3

volumetric flask

Question 4

How to prepare a standard solution (5 steps)

Answer 4

1. weigh solid accurately
2. dissolve solid in beaker using distilled water
3. pour solution into volumetric flask and rinse traces into flask, using distilled water
4. fill flask to GRADUATION line, by adding distilled water one drop at a time, until bottom of meniscus lines up with mark (view at eye level)
5. slowly invert volumetric flask several times to mix solution thoroughly

Question 5

A burette reading is recorded to the nearest…

Answer 5

0.05cm3 (reading has 2 decimal places, with last place either a 0 or 5)

Question 6

What are concordant results?

Answer 6

within 0.10cm3 of each other

Question 7

What is the end point of a titration?

Answer 7

when the indicator changes colour