4. Acids and Redox

Question 1

What are reduction and oxidation in terms of electrons?

Answer 1

reduction: gain of e-
oxidation: loss of e-

Question 2

What are reduction and oxidation in terms of oxygen?

Answer 2

reduction: removal of oxygen from a compound
oxidation: addition of oxygen to a compound

Question 3

What are reduction and oxidation in terms of oxidation number?

Answer 3

reduction: a decrease in oxidation number (becomes more negative)
oxidation : an increase in oxidation number (becomes less negative)

Question 4

What makes a strong acid strong?

Answer 4

it releases all its H+ ions and completely dissociates in aqueous solution

Question 5

How do you prepare a standard solution?

Answer 5

weigh out solute in boat to 0.01g and transfer to beaker
wash out boat and reweigh : find out difference
stir to dissolve solute, rinse beaker into volumetric flask
top up to line with distilled water + pipette
invert + label

Question 6

What are the tolerances of
10cm pipette
25cm pipette
50cm burette

Answer 6

+-0.04
+-0.06
+-0.10

Question 7

Describe how to do a titration

Answer 7

p44

Question 8

Name 2 acid + metal reactions which redox

Answer 8

zinc + HCl

aluminium + H2SO4