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pH Measurements and Buffer Laboratory Introduction

CHM130 pH and Buffer lab pH Measurements and Buffer Laboratory Introduction : pH is a measure of the acidity of an aqueous solution. It is related to the concentration of hydrogen ion, H+. The pH scale can tell if a liquid is more acid or more base, just as the Fahrenheit or Celsius scale is used to measure temperature. The range of the pH scale is from 0 to 14 from very acidic to very basic. A pH of 7 is neutral. A pH less than 7 is acidic and greater than 7 is basic. Each whole pH value below 7 is ten times more acidic than the next higher value. The dissociation of water into hydrogen and hydroxide ions is the basis for the pH. scale. The pH is related to the concentration of hydrogen ions by the formula, pH = -log[H+]. It is a logarithmic relationship. When the concentration of hydrogen ion changes by a factor of 10, the pH changes by a factor of 1.

Examination of the effect of the addition of a strong acid/base to Buffered or Water Solutions: In this part of the exercise the new pH of the buffers, solutions 1 and 2 will be measured after a strong base and acid solution have been added. The initial and final pH of an unbuffered solution, RO water, will also be …

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