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Acids, Bases, pH

Acids, Bases, pH.

rana-phelps
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Acids, Bases, pH

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  1. Acids, Bases, pH 􀁡H2O + H2O = H3O + and OH - 􀁡by convection we write: H2O = H + and OH - 􀁡pH = 7, neutral ,at equilibrium, [H + ] = [OH -]

  2. pH Scale = 0-14 􀁡acid: dissociates H + , pH below 7, eg. HCl = H + and Cl - 􀁡base: dissociates OH - accepts H + ,pH above 7 ex. NaOH = Na + and OH - ex. NH3 + H = NH4

  3. Measuring pH using plant pigment4.1 and 4.2 Anthocyanins = plant pigments in cabbage used as pH indicator eg red at low pH 􀁡Procedure: 􀁠make standards with the following pH buffers and record their color: 2, 4, 6, 7, 8, 10, 12. Compare unknown(4.2)

  4. Ex 4.3 The pH meter is more accurate than plant indicators. 􀁡Procedure:Calibrate pH meter using pH 4 and pH 7 Determine pH of substances with pH meter and pH paper

  5. Buffers- 4.4 Buffer: prevents sudden pH changes 􀁡Procedure:􀁠determine the buffering capacity of two substances (A & B) Follow the book instructions 􀁠Graph your results for A & B 􀁠Record which is the better buffer 􀁡

  6. 4.5 How Effective are StomachAntacids- Instructor demo Antacid: used to neutralize excess acid 􀁡Procedure:􀁠ompare different antacids Rolaids, Tums, Alka-Seltzer 􀁠determine effectiveness of antacids per gram( use 0.5 grams of each) 􀁠run a control

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