Measuring acids and bases

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Presentation transcript:

Measuring acids and bases pH Measuring acids and bases

The pH scale is used to measure the strength of acids and bases pH: What is it? The pH scale is used to measure the strength of acids and bases

H2O H+ + OH-   pH: What is it? Some compounds break up into ions when they dissolve in water. Solutions with more H+ ions are more ACIDIC They have a LOW pH Solutions with less H+ ions are more BASIC They have a HIGH pH  H2O H+ + OH- 

Some properties of acids and bases pH: What is it? Some properties of acids and bases pH Example Characteristics Acids Neutral Bases Lemon vinegar soda, aspirin Sour, burns, dissolves things < 7 Pure Water ------ = 7 Soap, baking soda, ammonia > 7 Bitter, Slippery

pH: Looking at common items Battery Acid pH = 0 Orange Juice pH = 3 Ocean Water pH = 8 Oven Cleaner pH = 13

pH: Importance to Humans Blood has a pH of 7.4 (about neutral) If pH goes below 6.8 or above 7.8 it is deadly! To keep blood at the proper pH - our body uses buffers

pH: Buffers Buffers are weak acids or weak bases that neutralize, or weaken, strong acids or bases. In blood, buffers prevent pH change. Sodium bicarbonate, or baking soda, is a buffer