CONVERSEMOS:
Piensa algunas cosas ácidas que hayas probado.
¿Qué crees que tengan en común que les de ese sabor ácido?
CONVERSEMOS:
¿Qué podrías hacer para comprobar si un alimento es ácido sin tener que saborearlo?
CONVERSEMOS:
¿Qué crees que pasaría si mezclaras bicarbonato de sodio con un ácido de laboratorio fuerte?
| Identify the Acids worksheet | 1 per student |
| Identify the Acids - Answer Key teacher-only resource | 1 per class |
|
Clean-up Supplies (Eg. Paper Towels)
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1 roll per class |
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Baking Soda
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1 cup per class |
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Coffee Stirrers
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5 stirrers per group |
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Craft Sticks
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1 stick per pair |
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Cups (Plastic, 3 oz)
You can use 3oz paper cups, but vinegar will start to leak through some brands.
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2 cups per pair
|
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Dixie Cups (3 oz)
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4 cups per pair |
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Secret Substance 1
You can use any household substance such as lemonade, orange juice, ketchup, or mustard.
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1 cup per class
|
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Secret Substance 2
You can use any household substance such as lemonade, orange juice, ketchup, or mustard.
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1 cup per class
|
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Secret Substance 3
You can use any household substance such as lemonade, orange juice, ketchup, or mustard.
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1 cup per class
|
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White Vinegar
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1 cup per class |
You will need access to water for this activity.
We suggest students work in pairs. Homeschool students can work on their own.
Break each coffee stirrer in half. Each pair of students will need 5 halves as mixing sticks.
Gather your plastic 3-oz cups and separate them into two equal piles. Label all cups in one pile "W" and add about 1 tablespoon of water into each cup. Label all cups in the other pile "V" and add about 1 tablespoon of white vinegar into each cup.
Gather your paper 3-oz cups and separate them into four equal piles. Label all cups in one pile "B" and add about 1 tablespoon of baking soda into each cup. Label the remaining piles of cups "1", "2", and "3". Then, add 1 tablespoon of each household substance that you'll be testing. We suggest using acidic foods like mustard, ketchup, lemon juice, orange juice, or yogurt. You can also use milk or egg white as less acidic (or basic) substance.
Students will need supplies at two separate steps of the activity. In Step 2, they will need the following supplies.
Then, in Step 9, they will need the unknown substances and three clean mixing sticks.
Make observations and measurements to identify materials based on their properties.
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