Acids & Bases 7.5.6: Distinguish between acids and bases and use indicators (including litmus paper, pH paper, and phenolphthalein) to determine their.

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Acids & Bases 7.5.6: Distinguish between acids and bases and use indicators (including litmus paper, pH paper, and phenolphthalein) to determine their relative pH

Substances can be classified as acids, bases or neutral based on their pH. Acids and bases are solutions usually with water as the solvent.

pH The pH scale is a way to measure how acidic or basic a solution is. The pH range of a solution is between 0 and 14. (see chart) The pH of pure water is 7. Any solution with a pH of 7 is neutral solution. It is not an acid or a base.

The pH of an acidic solution is less than 7. The lower the number, the more acidic the solution. The pH of a basic solution is greater than 7; the higher the number, the more basic the solution.

Acid0Battery acid 1Stomach acid 2Lemon juice 3Colas/Orange juice 4Vinegar/Tomatoes 5Coffee/Carrot juice 6Rainwater Neutral7Pure Water/Blood Bases8Sea water 9Baking soda 10Bleach 11Household ammonia 12Lime water 13Oven cleaner 14Drain cleaner

Acids Can be identified by: 1) sour taste (lemons and oranges) 2) reaction with some metals (zinc) 3) reaction with bases to form a neutral pH solution (vinegar reacting with limestone; coke reacting with steak; boiled eggs soaked in soda – eats the enamel off of shell)

Base Can be identified by: 1) bitter taste (unsweetened coca) 2) slippery feel (dish detergent, bleach) 3) reaction with acids to form a neutral pH solution (antacid to soothe an upset stomach)

Neutral Solution It is neither an acid or a base. 1) pure water (has a pH of 7)

Indicators Indicators are substances that can be used to determine whether a solution is acidic, basic, or neutral. Types of Indicators: 1)Litmus paper 2)Phenolphthalein 3)pH paper

Litmus Paper Has a special dye on it that changes colors in the presence of an acid or a base. Blue litmus paper turns red in an acid and stays blue in a base. Red litmus paper turns blue in a base and stays red in an acid. Both red and blue litmus paper turn violet in a solution that is neutral (neither an acid or a base).

Phenolphthalein Is used to test for the presence of a base. It is a colorless chemical that turns magenta (bright pink) in a base, and stays colorless in neutral or acidic solutions.

pH paper Has a range of colors depending on the pH of the solution. The color of the paper is compared to the chart on the vial to determine the pH.