Titration

1
Titration

• A standard solution is used to determine the
  concentration of another solution

2
Titration

• Usually this is a neutralization reaction.
• Acid Base ? salt water
• We use an indicator to tell when all the acid has
  reacted with all of the base (noted by a color
  change).
• Color change tell you its the end point (all
  acid is neutralized)

3
Neutralization

• Is the key idea
• Acid Base ? salt water
• at the neutralization point moles of acid equal
  moles of base (Hydronium hydroxide)
• at the neutral point (end point) the indicator
  changes color.
• Moles acid moles base

4
Start with a Standard Solution

• This is a solution of known concentration
  (Molarity).

5
Ex. If 25ml of a .2M solution of NaOH are used
to titrate 18ml of HCl, whats the molarity of
the HCl?

• Find the moles of base used.

25 ml

• This is the amount of NaOH used and its also the
  amount of hydroxide ions needed to neutralize the
  acid.

6
Ex. If 25ml of a .2M solution of NaOH are used
to titrate 18ml of HCl, whats the molarity of
the HCl?

• Moles of base moles of acid.

0.005 mol NaOH
HCl
0.28 M
18 ml
7
Titration

• macid Vacid mbase Vbase

8
TitrationStrong acid with strong base
14
pH
7
mL
9
TitrationWeak acid with strong base
14
pH
7
mL
10
Titration strong acid with weak base
14
pH
7
mL