Alien Juice Bar Virtual Lab worksheet guiding students through a pH experiment with cabbage juice.

To solve this "Alien Juice Bar" lab, we need to know how red cabbage juice works as a pH indicator. Red cabbage contains a natural dye that changes color depending on whether a liquid is an acid, a base, or neutral.

Here is the general rule for red cabbage indicator colors:
* Acids turn the juice Red or Pink.
* Neutral liquids keep the juice Purple (its original color).
* Bases turn the juice Blue, Green, or Yellow.

Now, let's look at the specific drinks listed in your worksheet to fill in the tables.

Challenge 1 Analysis

1. Window Cleaner: Most window cleaners contain ammonia, which is a strong base.
* *Color:* Green or Blue-Green.
* *Type:* Base.
2. Lemon Juice: Lemons contain citric acid.
* *Color:* Red or Pink.
* *Type:* Acid.
3. Water: Pure water has a neutral pH (pH 7).
* *Color:* Purple.
* *Type:* Neutral.

"Test More" Analysis

In the second part of the lab, you usually test nine common household items. While the specific list can vary slightly by version, these are the standard results for the Alien Juice Bar simulation:

Acids (Turn Red/Pink):
* Lemon Juice
* Orange Juice
* Soda (like Sprite or Coke)
* Vinegar
* Coffee

Neutral (Stays Purple):
* Water
* Milk
* Sugar Water (or sometimes Saliva)

Bases (Turn Green/Blue/Yellow):
* Window Cleaner (Ammonia)
* Bleach
* Hand Soap (or Dish Soap)
* Baking Soda solution
* Antacid (like Tums mixed with water)

***

Final Answer

Here is the information you need to fill into your data tables.

Table 1: Challenge 1

| Drink | Color in Beaker | Acid, Neutral, or Base? |
| :--- | :--- | :--- |
| Window Cleaner | Green (or Blue-Green) | Base |
| Lemon Juice | Red (or Pink) | Acid |
| Water | Purple | Neutral |

Table 2: Test More (Categorization)

*Note: Depending on the specific version of the game, some items like "Milk" might appear slightly pinkish, but they are generally categorized as Neutral in this lab.*

| Acid | Neutral | Base |
| :--- | :--- | :--- |
| Lemon Juice | Water | Window Cleaner |
| Orange Juice | Milk | Bleach |
| Soda / Pop | Sugar Water | Hand Soap |
| Vinegar | | Baking Soda |
| Coffee | | Antacid |