Erichrom black tea ( T H indicator) preparation .
*** 0.2 gm indicator add in 75 ml triethanol amine and 25 ml methanol or Ethanol
Then
Mix 1 gm indicator with 500ml distilled water
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*** 0.2 gm indicator add in 75 ml triethanol amine and 25 ml methanol or Ethanol
Then
Mix 1 gm indicator with 500ml distilled water
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