Cerys Ng Siew Ming's answer to Jonas Kwan's Secondary 2 Maths question.
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Red litmus turns blue when alkali.
Blue litmus turn red when acid.
Acid colour indicator is red. so red litmus paper cant red test for acidity.
Blue litmus turn red when acid.
Acid colour indicator is red. so red litmus paper cant red test for acidity.
Date Posted:
7 years ago
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