Topic: pH and Indicators

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General Chemistry Spring 2010

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Presentation transcript:

Topic: pH and Indicators List the following as an acid or base HCl b) KOH c) CH3COOH d)HF Which of the following would have a pH greater than 7 a) HCl b) CH3OH c) KOH d) NaCl

pH scale power (or potential) of Hydrogen Ranges from 0-14 measures H+ concentration [H+] the more H+, the more acidic the solution

Acid, Base, or Neutral H+1 > OH-1 OH-1 > H+1 [H+] = [OH-] Neutral solution: pH = 7 Acidic solution: pH LESS THEN 7 Basic solution: pH GREATER THEN 7 H+1 > OH-1 OH-1 > H+1

How to safely test pH NEVER “taste” Instruments – use a pH meter See if the substance reacts with a metal other than Cu, Ag, or Au Indicators – use a series of indicators

Indicator substance that changes color over narrow pH range

What color would the following indicators be in a neutral solution? yellow green colorless purple blue yellow

Use several indicators to narrow down pH range of substance Ex: Three samples of the same solution are tested, each with a different indicator. All three indicators, bromthymol blue, bromcresol green and thymol blue, appear blue The pH of the solution must be greater than_____

Practice using table M 1. What indicator is yellow with a pH 9. 8 2 Practice using table M 1. What indicator is yellow with a pH 9.8 2. Which indictor is blue with a pH of 5.6 0-3.0 Orange Green Pink Purple 3.1.-4.4 4.5-14 7.7-14 8.4-14 0-3.7 3.8-5.4 5.5-14 9.7-14