pH scale

Presented by:Kallie Goins

What is a pH scale?

It is a scale to measure how acidic or basic a liquid is

pH scale focuses on concentrations of hydrogen ions (H+) and hydroxide ions (OH-)

Continue with the pH scale

The scale goes from values very close to 0 through 14

Pure water is a 7 (right in the middle) on the scale

Acids are found between 0 to 7 Bases are between 7 to 14

What are Acids and Bases

Acids- are ionic compounds (a compound with a negative or positive charge) that break apart in water to form a hydrogen ion

Ex. vinegar, citrus fruits, and stomach acids Bases- are ionic compounds that break apart to

form a negatively charged hydroxide ion in water

Ex. lye (sodium hydroxide), ammonia

What is a base

• Bases- are ionic compounds that break apart to form a negatively charged hydroxide ion in water.

• Ex. lye (sodium hydroxide), ammonia

What are neutrals?

A neutral is neither an acid or a base. It is a 7 on the scale If something is 6.9 it is considered an acid If something is a 7.1 it is considered a base

acids

• These are lemons they are an acidic

Neutral

• This is a frozen fresh water, waterfall

• This is a neutral it is neither a acid or base

Basic

• Lye is a basic if you get it on you it can give you severe burns.

This is a pH scale

Stomach acid, coke, battery acid, vinegar, and rain water are acids.

Baking soda, ammonia, and NaOH are bases

So what about bleach

Bleach is a base The reason bleach is slippery is because it is

taking fat out of your skin That is why it is hard to wash bleach off your

skin because oil from the fat and water don't mix

Bases and acids continued

Bases taste bitter, feel slippery, and some bases can be very dangerous and burn your skin.

Acids taste sour, react strongly with metals, and some acids can burn your skin and be very dangerous.

Acids continued

• Acids taste sour, react strongly with metals, and some acids can burn your skin and be very dangerous.

Picture resources

• http://en.wikipedia.org/wiki/Waterfall

• http://en.wikipedia.org/wiki/Lemon

• http://en.wikipedia.org/wiki/Lye

• http://www3.oes.edu/ms/science6/Pictures%20of%20Science%20Concepts/Forms/DispForm.aspx?ID=8

Information resources

• http://www.chem4kids.com/files/react_acidbase.html

• http://staff.jccc.net/PDECELL/chemistry/phscale.html

• http://www.elmhurst.edu/~chm/vchembook/184ph.html