1. West Valley High School General Chemistry Mr. Mata
Acids & Bases Chapter 14A
West Valley High School
General Chemistry
Mr. Mata

2. Standard 5C
Students will know the observable properties of acids, bases, & salts.

3. Essential Question:
What are the general properties of acids and bases?

4. PROPERTIES OF ACIDS General formula of acid is HX.
Sour taste; corrosive; contain H +1 (hydrogen ions).
Aqueous solutions are electrolytes.
Cause indicators to change color:
BLUE LITMUS PAPER + ACID -> RED COLOR
React with some metals to produce H2(g).
React with bases to produce salt & water.
pH = 0 to on pH scale.
Ex: vinegar, citrus fruits

5. Properties of Bases General formula XOH (where X is a metal).
Taste bitter; corrosive; OH -1 (hydroxide ions).
Feel slippery to touch.
Cause indicators to change color:
RED LITMUS PAPER + BASE -> BLUE COLOR
Aqueous solutions are electrolytes.
React with acids to produce salt and water.
pH = – 14 on pH scale.
Ex: ammonia, lye

6. Neutralization Reaction
Acid + Base -> Salt + Water
ex: HCl + NaOH -> NaCl + H2O
H + 1 ion combines with OH -1 ion -> H2O.
Na +1 ion combines with Cl -1 ion -> NaCl.
H2O is neutral with pH = 7.000

7. Arrhenius Acids and Bases
Svante Arrhenius (1884) proposed theory of ionization for acids & bases.
Definition
- Acids release hydrogen ions (H +1).
- Bases release hydroxide ions (OH -1).

8. Arrhenius Acids and Bases
Acids may be mono, di, or tri protic.
Nitric acid (HNO3) = ? H +1 ion
1 H +1 ion = monoprotic acid
Sulfuric acid (H2SO4) = ? H +1 ion
2 H +1 ions = diprotic acid
Phosphoric acid (H3PO4) = ? H +1 ion
3 H +1 ions = triprotic acid

9. Bronsted-Lowry Acids and Bases
Bronsted-Lowry acid = H +1 ion donor.
Bronsted-Lowry base = H +1 ion acceptor.
H +1
Ex: H2O + NH3 -> OH NH4 +1
acid base

10. Meaning of pH pH = “power of hydrogen”.
Acids have pH from 0 to
A neutral solution has a pH of
Bases have pH from to 14.
pH + pOH = 14
“[ ]” = concentration or molarity
[H+ 1] x [OH- 1] = 1 x M

11. The pH Concept
Express large [H+ 1] ion concentrations using smaller numbers.
Logrithmic scale (base 10 units).
pH = - log [H+ 1]
[H+] = 1 x 10 –3 M -> pH = 3 (acidic)
[H+] = 1 x 10 –7 M -> pH = 7 (neutral)
[H+] = 1 x 10 –11 M -> pH = 11 (basic)

12. The pH Scale 1 pH unit change = 10x change • pH > 7 basic
• pH = 7 neutral
• pH < 7 acidic

13. Measuring pH Variety of different indicators.
Indicators are acids or bases that change color with the changing [H+1].
Phenol Red (swimming pools) and phenolphthalein (trace blood).
Can use pH meter, litmus paper (red or blue), pH paper.

14. Chapter 14A SUTW Prompt
Describe how acids and bases are organized on the pH scale.
Complete a sentence paragraph using the SUTW paragraph format. Hilight using green, yellow, and pink.
Due Date: Monday, February 5, 2018 (start of class).