1. (Acid/Base neutralization)
Due Today:
pH and pOH handout
Due Tomorrow:
Titration practice
(Acid/Base neutralization)
Acid Base Test
3/8/2017
Due 3/9 Extra Credit
March 5, 2018
An acid does NOT completely ionize. Is it strong or weak?
If you have a low pH what is the [H+], high or low?
What is needed to be classified as an Arrhenius base?
If pH increases, what concentration increases, [H+] or [OH-]?
5. When diluting an acid, do you add water to the acid or add acid to the water?

2. Titration

3. Water self-ionizes = autoionization
titration
Quick Review: Amphoteric
A substance that acts as both an acid and a base
Ex: H2O + NH3  NH4+ + OH-
Ex: HCl + H2O  H3O+ + Cl-
Ex: H2O + H2O  OH- + H3O+
*** H3O+ = Hydronium – what is made when H2O acts like a base  treated like H+ A B CA CB A B CA CB
Water self-ionizes = autoionization A B CB CA

4. Neutralization Acid + Base —> Salt + H2O
What is neutralization?
Acid and base in solution react to form water and salt
Acid + Base —> Salt + H2O
Ex: HCl + NaOH —> NaCl + H2O

5. Titration
What is acid-base titration? A method for determining the unknown concentration of a solution by reacting a known volume of that solution with a solution of known concentration.
Add NaOH in small amounts and swirl to mix
Continue until the equivalence point is reached

6. Titration set up (Draw it!!)
And known volume
And known volume

7. Equivalence Point **Equivalence Point**
Moles of acid = moles of base
Equivalence point can be determined by an indicator or pH reading
***indicator: there will be a color change
pH reading: there will be a large change in pH
Substance in the buret called titrant.

8. Equivalence point

9. Indicators What are indicators for?
Used to detect equivalence point instead of using pH meter
The best indicator to use depends on which acid and base are being titration
Different indicators detect pH in different ranges
Ex: phenolphthalein pH ~8-9.8
Ex: methyl orange pH ~

10. End point
What is the end point? Point at which indicator has changed color, signals when just enough titrant has been added to reach the equivalence point

11. Example – to the board!
HCl + NaOH —> NaCl + H2O 25 ml of HCl and ml of 0.1M NaOH. What is the [HCl]?