1. Neutralization Reactions
Chemistry
Neutralization Reactions

2. Indicators
Several chemicals change colour when they are placed in acidic or basic solutions
These are called indicators because they indicate the pH of the substance
Some are natural (Red Cabbage) and some are synthetic (Bromothymol)

3. Neutralization Reactions
When an acid reacts with a base
pH moves towards 7
Double displacement reactions
E.g. HCl(aq) + NaOH(aq)  HOH(l) (H20)(l) + NaCl(aq)
Produces a
salt and water Acid + Base  Water+ Salt

4. Neutralization Examples
HCl + NaOH  H2O + NaCl
H2SO4 + 2KOH  2H2O + K2SO4
Basically…
H+ + OH-  HOH = H2O
The other portions of the acid and base join
to make a salt.

5. What is a salt?
A combination of positive and negative ions formed by the reaction of an acid and a base (ionic compound).
Can re-hydrate (add water) to form an acid and a base.

6. Application of Neutralization Reactions
Cleaning up chemical spills

7. Base + Acid  Water + Salt
Application Con’t
Base + Acid  Water + Salt

8. Application - Heart Burn
Understanding Heart Burn

9. Heart Burn
Your stomach produces hydrochloric acid with a pH around 1.5
Some of the acid can escape up into your esophagus (where the food goes down) causing discomfort

10. Heart Burn Neutralization Reaction
2HCl(aq) + Mg(OH)2(aq)  2H2O(l) + MgCl2(aq) Stomach Acid Antacid Water Salt (HCl) (Base)