Tomato Chemistry Project CREATING Ph INDICATOR

Summary

In this experiment, the presenter demonstrates how to create a natural pH indicator using tomatoes, then tests various substances to determine their pH levels. After preparing the tomato-based indicator, they test solutions like lemon juice, vinegar, baking soda, hand soap, Fanta, and milk. The presenter observes color changes in the indicator liquid, identifying the pH levels of each substance, from highly acidic lemon juice to alkaline hand soap. The video concludes with a reflection on the results, confirming most of their predictions and providing educational insights into pH measurement.

Takeaways

• 😀 Tomatoes can be used to create a natural pH indicator solution by boiling them and extracting the liquid.
• 😀 The tomato pH indicator changes color when exposed to different liquids, allowing us to visually test their pH levels.
• 😀 Boiling water is added to chopped tomatoes, and the mixture is steeped for 25 minutes to extract the pH-sensitive liquid.
• 😀 After steeping, the tomato liquid is strained to remove solid pieces, leaving only the pH indicator liquid.
• 😀 Lemon juice turns the tomato indicator a pinkish color, indicating an acidic pH between 2-3.
• 😀 Baking soda solution causes the tomato indicator to turn red, suggesting a strongly alkaline pH (11-12).
• 😀 Vinegar causes the indicator to turn brownish, indicating a mildly acidic pH (around 3-4).
• 😀 Fanta causes the indicator to turn orange, showing it has a mildly acidic pH (around 4).
• 😀 Hand soap turns the tomato indicator purple, indicating a high alkaline pH (around 10-11).
• 😀 Milk causes the tomato indicator to turn light pink, suggesting a neutral or slightly acidic pH (around 6-7).

Q & A

What is the main goal of the experiment described in the video?

The main goal of the experiment is to test the pH of various substances using a tomato-based indicator, observing how the color changes based on the acidity or alkalinity of each substance.

How is the pH indicator created in the experiment?

The pH indicator is created by cutting tomatoes into pieces, boiling them in water, and then straining the mixture to obtain the liquid, which serves as the indicator.

Which substances were tested with the tomato-based pH indicator?

The substances tested include lemon juice, baking soda solution, vinegar, Fanta, hand soap, and milk.

What color does the pH indicator turn when lemon juice is added?

When lemon juice is added, the pH indicator turns pinkish, indicating that lemon juice is acidic with a pH of around 2-4.

What was the color change when baking soda solution was tested with the indicator?

The pH indicator turned red when tested with baking soda solution, indicating a pH of about 1, which is strongly acidic.

How does vinegar affect the pH indicator?

Vinegar caused the pH indicator to turn brown, possibly due to its concentration, and has a pH of about 3, indicating it is mildly acidic.

What color does Fanta produce in the pH indicator, and what is its pH range?

Fanta turns the pH indicator orange, with a pH range of about 4-6, indicating it is mildly acidic.

What result was observed when hand soap was tested with the indicator?

Hand soap caused the pH indicator to turn white or colorless, showing an alkaline pH of about 14.

What color does milk produce in the pH indicator, and what is its pH?

Milk turns the pH indicator light pink, with a pH of around 8, indicating that it is slightly alkaline.

How did the experiment confirm or challenge the initial predictions about the substances tested?

The experiment confirmed many of the initial predictions, such as hand soap being alkaline (pH 14) and lemon juice being acidic (pH 2-4). However, it also showed some unexpected results, like vinegar's color being brown rather than the anticipated orange and Fanta’s pH being closer to that of vinegar than expected.