Methods for Reliable and Accurate Measures of pH pH Measurement Methods for Reliable and Accurate Measures of pH

Definition of pH A way to measure acids (acidic) and bases (alkalinity) in food. Expression of the concentration of hydrogen (H+) and hydroxide ions (OH-) in an aqueous solution (water-based). Uses a scale between 0 and 14 A 2.02 -- pH Measurement

Measurement Method– Litmus Paper 1. Used by dipping litmus paper into solution 2. Turns yellow to red in acidic solution (acid) 3. Turns green or blue in alkaline solution (base) 4. Easy method 5. Not completely accurate A 2.02 -- pH Measurement

Measurement Method – Indicator Strips Dip the strip into the aqueous (liquid) food being tested for a few seconds. Remove strip from test solution and compare color segments to center color printed on the strip. A 2.02 -- pH Measurement

Measurement Method – Indicator Dye Organic dyes Done with dropper Acidic (acid) -- pink or red Alkaline (base) -- green or blue Neutral solution may turn lilac Not totally accurate A 2.02 -- pH Measurement

Measurement Method – pH Meter Digital reading Accurate Some units are expensive Easy and sanitary A 2.02 -- pH Measurement

Measure Method – Titratable Acidity 1. Add base with know pH to an acid. 2. Use burette. 3. More difficult to calculate. 4. Use if have chemistry knowledge. A 2.02 -- pH Measurement