By Danya Ardis

Characteristics Of Acids

Acids can be characterized by:

1. A sour taste.

2. It turns blue litmus paper red

3. It tastes sour. Try drinking lemon juice (citric acid)

Characteristics of Bases

A Base is characterized by:

1. A bitter taste. (Milk of Magnesia)

2. It feels slippery. (Soapy Water)

3. It turns Red Litmus Blue.

The pH Scale

Neutral Weak Alkali

Strong

Alkali

Weak Acid

Strong Acid

7 8 9 10 11 12 133 4 5 62 141 7 8 9 10 11 12 133 4 5 62 141 9 10 11 123 4 5 621

The ph scale measure how acidic or basic a solution is

Identifying Acids and Bases

• Acids have a ph from 0-7

• Lower pH value indicates a stronger acid.

• Bases have a pH from 7-14

• Higher pH value indicates a stronger base.

pH Scale

Acid Base

0

7

14

[H[H++] pH] pH

10-14 14

10-13 13

10-12 12

10-11 11

10-10 10

10-9 9

10-8 8

10-7 7

10-6 6

10-5 5

10-4 4

10-3 3

10-2 2

10-1 1

100 0

1 M NaOH

Ammonia(householdcleaner)

BloodPure wateMilk

VinegarLemon juiceStomach acid

1 M HCl

Aci

dic

N

eutr

al

Bas

ic

Did we Miss something??• What happens when the pH of a

substance is 7?

• Ans: A pH level of 7 indicates a Neutral Substance i.e: Water!