I did an acid-base extraction experiment. First extracted a solid mixture containing benzoic acid, p-nitroaniline, and naphthalene into three separate solutions:
- NaOH extract
- HCl extract
3.organic with the neutral compound.
Then the HCl and NaOH extracts were neutralized and underwent vacuum filtration to isolate crude p-nitroaniline and crude benzoic acid, while the organic solution underwent rotary evaporation to get crude naphthalene.
Crude benzoic acid was purified by recrystallization using hot filtration, and then benzoic acid crystals were isolated by suction filtration. The melting range of the benzoic was relatively pure.
How can I improve this experiment? My recovery of benzoic acid was less than 40%
And as for sources of error, extraction processes always lose some compound during each step. What are other probable sources of error?