Question

You find a mysterious white powder in your kitchen. It could be cream of tartar (pH=5), sugar (pH=7), baking soda (pH=8), or drain cleaner (pH=14). Explain which pH indicator(s) you would use to determine the unknown substance.
1) Phenolphthalein (PHT) 2) Red cabbage 3) Bromthymol blue 4)Congo red (CR)

Answer 1

The pH indicators to be used are Phenolphthalein, Red cabbage, Bromthymol blue and Congo red.

What are pH indicators?

Indicators are substances which change color as the pH of a medium changes.

The common indicators and their pH range is as follows:

• Phenolphthalein - pH range of 8.3 and 10.5
• Red cabbage - pH 2 to 10
• Bromthymol blue - 6.0 to 7.6
• Congo red - 3.0 to 5.2

Therefore, the indicators to be used are Phenolphthalein, Red cabbage, Bromthymol blue and Congo red.

Learn more about pH indicators at: brainly.com/question/13779537

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