name: bianca
date:
student exploration: ph analysis: quad color indicator
vocabulary: acid, acidic, alkaline, base, indicator, neutral, ph
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?

Question

name: bianca
date:
student exploration: ph analysis: quad color indicator
vocabulary: acid, acidic, alkaline, base, indicator, neutral, ph
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?

Accepted Answer

# Brief Explanations:
1. A. Lemon juice tastes sour as it is an acid.
   - B. If lemon juice gets in your eye, it stings due to the presence of hydrogen - ions which can irritate the sensitive eye tissue.
2. A. Soap feels slippery because of the presence of fatty - acid salts in it which reduce friction.
   - B. Soap tastes bitter as it is a base and has a characteristic bitter taste.
   - C. If soap gets in your eye, it burns and stings as bases can be irritating to the eye.
3. 1. When testing ammonia with pH paper, the pH paper typically turns a dark blue color (since ammonia is a base).
   - 2. Ammonia has a pH of around 11 - 12. It is alkaline because its pH is above 7.
# Answer:
1. A. Sour
   - B. Stinging
2. A. Slippery
   - B. Bitter
   - C. Burning/stinging
3. 1. Dark blue
   - 2. Around 11 - 12; Alkaline

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