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Student Exploration: pH Analysis. Vocabulary: acid, acidic, alkaline, base, indicator, neutral, pH . ... The pH Analysis Gizmo™ allows you to find the pH of a
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Answer Key For Ph Analysis Gizmo ... Gizmo Answers , Gizmo Dichotomous Key , Gizmo Warm Up , Gizzmo Log In€. Prior Knowledge Questions (Do these BEFORE using the
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Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Acids are substances that produce hydrogen ions (H+) when dissolved in water. Lemon juice is an example of an acid. A. What does lemon juice taste like? ________________________________________ B. What does it feel like if lemon juice gets in your eye? _________________________ 2. Bases are substances that produce hydroxide ions (OH-) when dissolved in water. Hand soap is an example of a base. A. What does soap feel like? ______________________________________________ B. What does soap taste like? _____________________________________________ C. What does it feel like if soap gets in your eye? ______________________________ Gizmo Warm-up The strength of an acid or base is measured on the pH scale. The term “pH” is short for “potential of hydrogen.” It is a measure of how many excess H+ ions there are in a solution. The pH scale runs from 0 to 14, with 0 representing the highest concentration of hydrogen ions. Acidic substances have a pH below 7, while alkaline substances (bases) have a pH above 7. Pure water has a pH of 7 and is considered neutral. The pH Analysis: Quad Color Indicator Gizmo™ allows you to find the pH of a variety of liquids. In the Gizmo, check that the Substance in the tube is Ammonia, and click Test. 1. Indicators change color in acids or bases. What are the colors of the pH paper? _________________________________________________________________________ 2. Compare the paper to the pH color chart. What is the pH of ammonia? ________________ Is ammonia acidic or alkaline? ________________________________________________
Get the Gizmo ready:
Activity A:
Click Reset. Check that the 0-14 paper is selected.
Measuring pH
Goal: Find the pH of 18 common substances. 1. Test: Use the Gizmo to find the pH of each of the available substances. Classify each substance as acidic (pH < 7), alkaline (ph > 7), or neutral (pH = 7).
0-14 pH indicator paper Material in the tube
pH value
Acidic, alkaline, or neutral?
Baking soda Bleach Coffee Cola Drain cleaner Hand soap Juice (lemon) Juice (orange) Juice (tomato) Milk Milk of magnesia Oven cleaner Saliva (human) Shampoo Stomach acid Vinegar Water (distilled) Water (ocean)
2. Summarize: Compare all the acidic substances and all the alkaline substances. A. In general, what types of substances tend to be acidic? _______________________ ___________________________________________________________________ B. What types of substances tend to be alkaline? ______________________________ ___________________________________________________________________
Get the Gizmo ready:
Activity B: More accurate pH
Click Reset. Select the 4.5-7.5 paper.
Goal: Find the pH of substances in a more accurate way. 1. Test: Before you begin testing with the 4.5-7.5 paper, list the pH values of the substances below that you found using the 0-14 pH indicator paper. Then find the pH of each substance with the 4.5-7.5 paper.
2. Analyze: Compare the pH values in each column. A. How do these values compare? _________________________________________ ___________________________________________________________________ B. What is an advantage of using the 4.5-7.5 paper? ___________________________ ___________________________________________________________________ C. What is a disadvantage of using the 4.5-7.5 paper? __________________________ ___________________________________________________________________ D. Given the results from two kinds of indicator paper, which substances appear to be neutral (pH = 7)? _____________________________________________________
