Acids & Bases

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Acids & Bases

By Robert McGee

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Our Goals for today

To determine the difference between Acids & Bases

Discuss the importance of studying Acids & Bases

Perform an experiment dealing with Acids & Bases

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What is the pH scale?

The pH scale measures how acidic or basic a solution is.

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The pH scale

The pH scale is the concentration of hydrogen ions in a given substance.

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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.

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Definitions of Acids and Bases

An acid is a substance that breaks into ions in an aqueous solution.

A Base (alkaline) is a substance that breaks into ions in an aqueous solution.

Note: aqueous solution is any solution where is the solvent.

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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!

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Test Your Knowledge

What is the range of an ACID on the pH scale?

Ans: 0-7

What is the range of a BASE and what is another name for a BASE?

Ans: 7-14, Alkaline

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Characteristics Of Acids

Acids can be characterized by:

A sour taste.

It turns blue litmus paper red

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

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Characteristics of Bases

A Base is characterized by:

A bitter taste. (Milk of Magnesia)

It feels slippery. (Soapy Water)

It turns Red Litmus Blue.

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Why Learn about Acids & Bases?

What do you think is the pH level of NYC tap water?

The pH of a swimming pool must be checked periodically. Why?

Is it important for Lakes & Rivers to maintain a certain pH?

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