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copyright cmassengale The Chemistry of Life pH scale copyright cmassengale

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

copyright cmassengale The pH Scale Indicates the concentration of H+ ions Ranges from 0 – 14 pH of 7 is neutral (equal parts H and OH) pH 0 up to 6.9  acid … H+ released pH above 7.1 to 14 base OH- released Each pH unit represents a factor of 10X change in concentration copyright cmassengale

copyright cmassengale Acids High in H+ ions Lower number of OH- ions 0-6.9 copyright cmassengale

Characteristics of acids Taste sour Corrodes metal Turns litmus indicator red copyright cmassengale

copyright cmassengale Bases High in OH-ions Lower in number of H+ ions pH 7.1-14 copyright cmassengale

Characteristics of bases Tastes bitter Feels slippery Turns litmus blue copyright cmassengale

Strength of acid and base The closer the pH is to neutral the weaker it is. The further away the pH is from neutral the stronger it is 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 Acid or Base? copyright cmassengale

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