Acids and Bases Notes. Scientists use a range of numbers, called a pH scale, to tell how acidic or basic a solution is.

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Presentation transcript:

Acids and Bases Notes

Scientists use a range of numbers, called a pH scale, to tell how acidic or basic a solution is.

The pH scale is the concentration of hydrogen ions in a given substance. Luckily as 7 th graders we are going to just stick to the basics.

On the scale..... Acids range from 0-6 A solution that tests 7 is neutral Bases range from 8-14

Base Neutral Strong Acid Strong Base Weak Acid Weak Base Acid

Acids have the following characteristics: *strong smell *sour taste (NEVER put anything in your mouth unless you know what it is!) *corrosive (eat away at other materials)

*react with metals *contain hydrogen *can burn or sting skin

*bitter taste (NEVER put anything in your mouth unless you know what it is!) Bases have the following characteristics: *feel slippery *do NOT react with metals

*can burn the skin *can dissolve things *can be poisonous *also referred to as alkaline

Properties of Acids & Bases Video Clip

You can test a solution to find out whether it is an acid or a base by using an indicator. An indicator is a compound that changes color in the presence of acids or bases.

The indicator's shade or color will vary depending on the strength of the acid or base. Indicators include: *cabbage juice *litmus paper *pH paper

IndicatorWhen put in an acid, will turn this color When put in a base, will turn this color Neutral Cabbage JuicePINKGREENPURPLE Litmus PaperBlue paper turns red Red paper turns blue pH PaperRed/OrangeDark Green/BlueYellow

Indicators of Acids & Bases Video Clip

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