1. Other than food industries, name two more industries that you think use pH indicators? Explain the areas in which indicators are used by these industries.
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Answer:
1. Soap making or other cosmetic industry
2. Water treatment plants
Explanation:
1. They use pH to check whether the made cosmetics and its ingredients are safe to be applied or not
2. Water treatment plants use pH to make sure the water is not too acidic or basic
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