There are four major methods of purification in the chemistry laboratory. which of the given techniques is not one of the four most common methods for separation and purification?

The four major methods of separation and purification techniques in the laboratory are as follows,

1. Chromatography

2. Recrystallization,

3. Distillation, and

4. Extraction

Spectroscopy however is not a common separation and purification method

Explanation:

Mass spectrometer separates ions in respect to the ratio of their mass to the their charge and are then detected based on their relative abundance this technique is used in the analysis of biomolecules

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year