how we can say acid and base are strong or weak using litmus paper
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the use of litmus is to test whether it is an acid or a base. blue litmus turns into the red under acidic conditions and red litmus turns into blue under bases or Alkaline with color change occurring over the pH range 4.5 to 8.3 at 25 degrees Celsius and 77 degrees faranhet
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If blue litmus paper changes to red it means it is acid and if red litmus paper changes to blue it means it is base.
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