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Published byAbraham Curtis Modified over 7 years ago
Acids and Bases
Properties of Acids þ Produce H + (hydrogen) ions in water þ Taste sour þ Corrode metals þ React with bases to form a salt and water þ pH is less than 7 þ Turns blue litmus paper to red “Blue to Red A-CID”
Why the symbol for soda? Acetic acid (vinegar) Ascorbic acid (lemon juice) Hydrochloric acid (stomach acid) Examples of Common Acids
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”
Properties of Bases Many household products contain bases Strong bases can be dangerous
Properties of Bases Bases can help to ease the effects of too much stomach acid They are conveniently called ANTACIDS
Examples of Common Bases Bleach Laundry detergent Shampoo Soaps, toothpaste Tums, Alka-Seltzer (antacids)
Water - an acid or base? Water is neither acidic or basic – it is the only substance that is naturally neutral. pH = 7 (neutral)
Litmus Paper A base will turn litmus blue An acid will turn litmus red
Acid-Base Reactions A reaction between an acid and a base is called a neutralization
The pH scale is a way of expressing the strength of acids and bases. pH 1-6 = acid pH 7 = neutral pH 8-14 = base
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
pH indicators Indicators are dyes that can be added that will change color in the presence of an acid or base.
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