The pH Scale.

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Presentation transcript:

The pH Scale

Remember the household products lab? You tested household chemicals with litmus paper and pH paper. Product Color pH Formula Acid/Base? 1. 2. … 9.

What happened to the pH paper? pH paper (aka Universal Indicator Paper) What color(s) do/does the paper turn for acids? What color(s) do/does the paper turn for bases? Reds and oranges Greens and Blues

What is the pH scale? pH (potential hydrogen) is another way of representing the hydrogen ion (H+) concentration of a solution pH values range from 0 - 14

The pH scale Acidic solution: pH < 7.0 Neutral solution: pH = 7.0 Basic solution: pH > 7.0 Neutral ACIDIC BASIC pH = Increasing acidity Increasing basicity

The pH Scale

How can you tell the pH of a chemical? Indicators!!! Indicator paper (like pH paper) Liquid indicators (like phenolphthalein) pH meters

DEMO Why do chemistry teachers like to teach about hydroxides?

The pH range varies for different indicators Indicator: a chemical or solution that changes color at a certain pH The pH range varies for different indicators Titration Xample

Indicator Lab Many naturally colored compounds can behave as acid-base indicators. In this lab, you will be given a choice of several different fruits and vegetables. Your goal is to make indicator solutions from these fruits and vegetables. Do the following: Provide a complete set of instructions for making the indicator solution from the raw materials. (Hint: The indicator is usually located in the skin of the fruit or veggie. You will have to boil most of the fruits/veggies in a small amount of water.) Demonstrate that your indicator solution works for distinguishing between acids and bases. Create a data table listing your results for 3 indicator solutions. Your table should include (at a minimum) the indicator name and colors observed for pH = 1, 3, 5, 7, 9, 11. Use the rubric as a guide! Available Materials: solutions with various pH, carrots, blueberries, red cabbage, red grapes, apples, red onions, and tea leaves. 100mL beaker, deionized water, pipettes, well plates, scoopula.