📚 Learning Guide
pH Testing of Common Liquids
easy

You are in a laboratory conducting a pH test on various liquids, including lemon juice, baking soda solution, and soda. After testing, you observe that lemon juice turns the universal indicator paper red, the baking soda solution turns it blue, and soda shows a yellowish color. Based on this information, which statement accurately describes the pH levels of these liquids?

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Learning Path
Learning Path

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Choose the Best Answer

A

Lemon juice is acidic, baking soda is neutral, and soda is alkaline.

B

Lemon juice is acidic, baking soda is alkaline, and soda is acidic.

C

Lemon juice is neutral, baking soda is alkaline, and soda is acidic.

D

Lemon juice is neutral, baking soda is acidic, and soda is alkaline.

Understanding the Answer

Let's break down why this is correct

Answer

The red color on the indicator paper shows that lemon juice is acidic, giving it a pH below 7. The blue color means the baking soda solution is basic, so its pH is above 7. The yellow‑ish hue of soda indicates it is only slightly acidic or close to neutral, with a pH just under or near 7. Thus, lemon juice is acidic, the baking soda solution is basic, and soda is only mildly acidic or nearly neutral. This matches the colors we saw on the universal indicator paper.

Detailed Explanation

The red color shows lemon juice is acidic, the blue color shows baking soda is alkaline, and the yellowish color shows soda is acidic. Other options are incorrect because The idea that baking soda is neutral is wrong; The belief that lemon juice is neutral is incorrect.

Key Concepts

pH scale and acidity
use of universal indicator paper
chemical properties of common liquids
Topic

pH Testing of Common Liquids

Difficulty

easy level question

Cognitive Level

understand

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