acids and bases
DESCRIPTION
Acids and Bases. Properties of Acids. Produce H + (hydrogen) ions in water Taste sour Corrode metals React with bases to form a salt and water pH is less than 7 Turns blue litmus paper to red “Blue to Red A-CID”. Examples of Common Acids. Acetic acid (vinegar) - PowerPoint PPT PresentationTRANSCRIPT
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Acids and BasesAcids and Bases
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Properties of Acids
Produce H+ (hydrogen) ions in water
Taste sour
Corrode metals
React with bases to form a salt and water
pH is less than 7
Turns blue litmus paper to red “Blue to Red A-CID”
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Why the symbol for soda?Why the symbol for soda?
Acetic acid Acetic acid (vinegar)(vinegar)
Ascorbic acid Ascorbic acid (lemon juice)(lemon juice)
Hydrochloric acid Hydrochloric acid (stomach acid)(stomach acid)
Examples of Common Acids
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Properties of Bases
Produce OH- ions in water (hydroxyl ions)
Taste bitter, chalky
Are electrolytes
Feel soapy, slippery
pH greater than 7
Turns red litmus paper to blue “Basic Blue”
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Properties of Bases
•Many household products contain bases
•Strong bases can be dangerous
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Properties of Bases
•Bases can help to ease the effects of too much stomach acid
•They are conveniently called ANTACIDS
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Examples of Common Bases
Bleach Laundry detergent Shampoo Soaps, toothpaste Tums, Alka-Seltzer
(antacids)
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Water - an acid or base?
Water is neither acidic or basic – it is the only substance that is naturally neutral.
pH = 7 (neutral)
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Litmus Paper• A base will turn litmus blue
• An acid will turn litmus red
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Acid-Base Reactions
A reaction between an acid and a base is called a neutralization
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The pH scale is a way of expressing the strength of acids and bases.
pH 1-6 = acidpH 7 = neutralpH 8-14 = base
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pH Scale
• A pH lower than 7 is acidic• A pH higher than 7 is basic (alkaline)• If the pH is 7, the solution is neutral
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pH indicators
Indicators are dyes that can be added that will change color in the presence of an acid or base.