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investigate reactions between acids and bases; use indicators and the pH scale.

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investigate reactions between acids and bases; use indicators and the pH scale.

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CW 8.

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NOS 5, PW3, NOS 3, PW1

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Definition: a chemical substance, usually a liquid, which contains hydrogen and can react with other substances to form salts. Some acids burn or dissolve other substances that they come into contact with.

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Definition: a chemical substance, usually a liquid, which contains hydrogen and can react with other substances to form salts. Some acids burn or dissolve other substances that they come into contact with.

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Anything below 7 on a pH scale is acidic

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Citrus fruits, Sulfuric acid (car battery), Carbonic acid (rain)

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Hydrochloric acid, Sulfuric acid

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Sour tasting and corrosive

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Definition:  a substance that can neutralize the acid by reacting with hydrogen ions.

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Definition:  a substance that can neutralize the acid by reacting with hydrogen ions.

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greater than 7 on pH scale.

Also called alkaline

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Baking soda, soap, toothpaste, most cleaning chemicals

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Sodium hydroxide, ammonia

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This scale determines how basic or acidic something is 

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This scale determines how basic or acidic something is 

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Chemicals change colour depending on their pH

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Chemicals that changes colour depending on its pH. 

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Chemicals that changes colour depending on its pH. 

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1. Universal indicator

2. Methyl Orange

3. Acid-base litmus paper

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Range of colours that allow u to tell the pH.

Acid = red

Neutral = green

Base = purple

some shades can be similar that lead to human error.

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Acid = red

Neutral = pink

Base = yellow

shades can be similar and human error may occur

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Blue litmus paper turns red with the presence of an acid.

Red litmus paper turns blue in the presence of a base.

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questions will be asked throughout,

Animations are not shown on the above PowerPoint but are within.

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Students will use their chart of the universal indicator and decide what pH they believe the above are. They then will discuss with the class and the class will come to an agreed decision. Then answers will appear on next slide.

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the students will watch a video that demonstrates how the universal indicator works and they will carry out a few tests on different solutions.

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Acids & Bases Activity using Universal Indicator Solution