Section 6.2 The pH scale and Indicators

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Presentation transcript:

Section 6.2 The pH scale and Indicators Chapter 4: Developing Chemical Equations Chapter 5:Classifying Chemical Reactions Chapter 6:Acids and Bases Snc2dp Mrs. franklin

The pH Scale The pH scale: The pHs of a variety of solutions (pool water, foods and beverages, and solutions from industrial processes) are regularly monitored. The pH scale is a numerical scale, ranging from 0 to 14, that is used to classify solutions as acidic, basic, or neutral.

The pH Scale A pH (Power of Hydrogen) value relates to the concentration of hydrogen ions in a solution. Values increase or decrease exponentially (by a power of 10) as you move up or down the scale.

The pH Scale The more H+ ions there are in the solution, the smaller the pH value (<7) . (Acidic) The more OH- ions present in the solution, the greater the pH value (>7) (Basic). If the number of H+ and OH- ions are equal, the solution has a pH value of 7. (Neutral)

Checking for Understanding - The pH Scale How much more concentrated are the hydrogen ions in a solution that has a pH of 7 than the hydrogen ions in a solution that is pH 10?

Determining the pH of a Solution pH Indicators are substances that change colour to show the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in a solution.

Determining the pH of a Solution 1) pH Meters :have a sensor or probe that electronically produces a precise (real time) reading of the pH of a solution that is displayed digitally on the meter.

Determining the pH of a Solution 2) Red and Blue Litmus Paper – A chemically treated indicator paper. Blue litmus turns red in acids. Red litmus turns blue in bases. This simple indicator can determine whether a solution is acidic, basic, or neutral.

Determining the pH of a Solution 3) Universal Indicator and pH Paper: are composed of a mixture of indicators that change to different colours under different pH conditions. These indicators cover the entire pH range from 0-14. A key or legend of the colours and the pHs they represent is used to analyze the changes in the colour of the indicator.

Determining the pH of a Solution 3) Specific indicators that change colour within a very small range of pHs may be used to monitor small changes in pH within that range.

Determining the pH of a Solution 4) A variety of plants contain juices that can act as natural acid-base indicators. A few of these are listed below.

Comparing Acids and Bases

Homework Textbook: Complete pg. 235 # 1,2, 4, 6, 7 & 8