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copyright cmassengale Acids, Bases & pH 1 water molecule in 550 million naturally dissociates into a Hydrogen Ion and a Hydroxide Ion Hydrogen Ion Hydroxide Ion Acid Base H2O  H+ + OH- copyright cmassengale

How much stronger is a pH3 than a pH of 5? The pH Scale Indicates the concentration of H+ ions Ranges from 0 – 14 pH of 7 is neutral pH 0 up to 7  acid … H+ pH above 7 to 14  base… OH- Each pH unit represents a factor of 10X change in concentration How much stronger is a pH3 than a pH of 5? copyright cmassengale

copyright cmassengale Acids Strong Acid = pH 1-3 High in H+ ions Lower number of OH- ions copyright cmassengale

copyright cmassengale Bases Strong Base = pH 11 – 14 High in OH-ions Lower in number of H+ ions copyright cmassengale

copyright cmassengale Buffers Weak acids or bases that react with strong acids or bases Made by the body Prevent sharp, sudden changes in pH (keep pH neutral) Weak Acid Weak Base copyright cmassengale

copyright cmassengale

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