Neutralization Reactions

Chapter 19.4

Excess hydrochloric acid in the stomach can cause heartburn and a feeling of nausea.

Antacids neutralize the stomach acid and relieve the pain of acid indigestion. You will learn what a neutralization reaction is.

An Acid-Base Reaction

In general, the reaction of an acid with a base produces water and one of a class of compounds called salts.

This is called a Neutralization Reaction

Are the salts produced useful?

Titration

A VERY important and useful lab technique.

The process of adding a known amount of solution (mL) of known concentration (M) to determine the concentration of another solution is called titration.

The solution of known concentration is called the standard solution.

Titration

The point of neutralization is the end point of the titration.

When an acid and base are mixed, the equivalence point is when the number of moles of hydrogen ions equals the number of moles of hydroxide ions.

Titration

Calculation 1:

Answer

Calculation 1 Practice

Titration

▪ Remember the phenolphthalein indicator?

▪ We add the indicator to the unknown solution to tell us when the solution has been completely neutralized.

▪ The point at which the indicator changes color is the end point of the titration.

Titration

Acid solution with indicator

Added base is measured with a buret.

Color change shows neutralization.

This is the end point.

Titration

We can use digital pH probes.

Notice: pH = 7

Titration

Calculation 2:

Answer

Calculation 2 Practice

Titration Demonstration

Listen carefully so you can set up for lab next week…

Buret Acid and Base One solution has a known concentration One concentration is unknown (What you are

solving for!)

Phenolphthalein indicator Or pH probe

Titration Practice

Complete titration practice worksheet.

Turn in for a grade