Question

q7. the table below shows the data collected on four substances that were tested with litmus paper to determine if they were acids or bases. which of the substances is an acid? substance 1 2 3 4 red litmus red red blue red blue litmus red blue blue blue

Explanation:

Step1: Recall litmus - paper rules

Acids turn blue litmus paper red and have no effect on red litmus paper.

Step2: Analyze each substance

• Substance 1: Red litmus - red, Blue litmus - red. It turns blue litmus red, so it is an acid.
• Substance 2: Red litmus - red, Blue litmus - blue. It has no effect on either, so it is neutral.
• Substance 3: Red litmus - blue, Blue litmus - blue. It turns red litmus blue, so it is a base.
• Substance 4: Red litmus - red, Blue litmus - blue. It has no effect on either, so it is neutral.

Answer:

Substance 1