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Gizmo ph analysis answers, Lab Reports of Chemistry

University of Puerto Rico in PonceChemistry

Gizmo Warm-up, Measuring pH, Compare all the acidic substances and all the alkaline substances.

Typology: Lab Reports

2021/2022

Uploaded on 01/21/2022

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Name: ____________________________________________ Period: ______ Date: ______________
pH Gizmo
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 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. Wait until the
animation is finished.
1. Indicators change color in acids or bases. What is the color of the pH paper? _________
2. Compare the paper to the pH color chart. What is the pH of ammonia? _____________
3. Is ammonia acidic or alkaline? _____________
4. Without checking, make a prediction: What is the pH of stomach acid? _________
5. Ocean water generally has a pH of about 8. Is ocean water acidic or basic? _____________
6. Along with H2O molecules and NaCl (salt), what other ions does ocean water have floating around in it? H+ or (OH-)?
(HINT
Look back at the prior knowledge questions above.) (circle one)
7. Rising global temperatures cause oceans to absorb more CO2 from the atmosphere, which lowers the pH of the ocean
water. What effect do you think this might have on ocean life?
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Name: ____________________________________________ Period: ______ Date: ______________

pH Gizmo

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 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. Wait until the animation is finished.

  1. Indicators change color in acids or bases. What is the color of the pH paper? _________
  2. Compare the paper to the pH color chart. What is the pH of ammonia? _____________
  3. Is ammonia acidic or alkaline? _____________
  4. Without checking, make a prediction : What is the pH of stomach acid? _________
  5. Ocean water generally has a pH of about 8. Is ocean water acidic or basic? _____________
  6. Along with H 2 O molecules and NaCl (salt), what other ions does ocean water have floating around in it? H+^ or (OH-)? ( HINTLook back at the prior knowledge questions above. ) (circle one)
  7. Rising global temperatures cause oceans to absorb more CO 2 from the atmosphere, which lowers the pH of the ocean water. What effect do you think this might have on ocean life?

Measuring pH: Get the Gizmo ready by clicking “Reset”. Check that 0 - 1 4 paper is selected.

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)

  1. 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 basic, or alkaline?
  2. Do a quick Google search for “Why do soft drinks go flat?” Read what you find, and then explain why flat soda tastes different than cold, fresh soda:
  3. Acids are highly reactive with calcium carbonate (CaCO 3 ), which is the same substance chemical compound found in seashells. Besides clams and oysters, what other important types of organisms might be affected by rising acidity in the oceans, and HOW might it affect them? ( HINTUse the internet if you need help .) When finished, take the 5-question quiz at the bottom of the Gizmo. Record your score: _____ out of 5