Question

A colourless sample was tested with a strip of PH paper The colour of the strip changed to green .The sample should be :a tap water bdistilled water c sodium hydroxide d lemon juice

Answer 1

Answer:

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Answer 2

It is distilled water that turns PH paper green .

Explanation:

1. Every substance has a certain kind of nature .
2. The nature is referred as chemical nature .
3. The chemical nature can be acidic , alkaline or neutral .
4. pH paper is a special paper that is used to know about the nature of a given substance .

Depending upon the nature the substance pH paper  changes its colour .

• With neutral substance with pH 7 changes its colour to green .
• With acidic substance with pH ranging from 0-6 changes it to red .
• With alkaline  substance with pH ranging from 8-15 ,changes it to purple