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Acid and Alkali

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Yien-lin Liu

on 15 August 2013

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Transcript of Acid and Alkali

What is Acid?
Acid come from the Latin word 'acidus' mean sour.
It turns blue litmus paper red.
A solution of acid has a pH of 1-6.
A lower pH means a higher acidity.
Chemicals or substances having the property of an acid are said to be acidic.

Acid in Food
Tartalic acid
Malic acid
Cirtric acid
salicylic acid
What is Alkali?
In chemistry, an alkali is a base.
Some author also define an alkali as a base that dissolves in water.
It turns red litmus paper blue.
A solution of a soluble base has a pH greater than 7.
Chemical or substances having a properties of an alkali is called
By: LiN LiN

Orange - Citric acid
Apple - Malic acid
Lime Lemon - Citric acid
Somtam ( Tomatoes ) - Salicylic acid
Grapes - Tartalic acid
Hamburger & French Fries
Coca Cola
Citric acid
Added to food and drinks to give a pleasant sour taste.
As a polishing agent for metals.
Tartalic acid
As a favoring in food and drinks.
To produce fruit salts or health salts.
Sulfuric acid
Used in car batteries and fire extinguishers.
To produce fertilizers and detergents.
Hydrochloric acid
To clean metals before they are coated.
As cleansing agent in toilet cleaners.
Example Uses of Acid and Alkali
Sodium Hydroxide
To produce soaps, detergents, plastics, and rayon.
Calcium Hydroxide
To produce cement, mortar, soda lime, and glass.
To neutralize acidic soil in agriculture.
To prevent the coagulation of latex.
As a cleaning agent in glass and window cleaners
To produce nitric acid and fertilizers.
Magnesium Hydroxide
To produce medicines such as antacids, milk of magnesia and Epsom salt.
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