Example 1 ml fill 5% Phenol Sulfuric acid and 1 ml. extra leave to cool at room temperature to the value measure absorb light spectrophotometer at 490 nm .
The addition of 1 ml 5% Phenol 1 ml. Then add Sulfuric acid and leave to cool to room temperature. taken to measure the absorbance. spectrophotometer at 490 nm
For example 1 ml fill 5% Phenol 1 ml. Then add Sulfuric acid leave to cool to room temperature. The measured absorbance spectrophotometer. The 490 nm .