The major advantage of using ground glassware ( round bottom flask, distillation condenser, thermometer adapter, separatory funnel) in the organic lab is

The major advantage of using ground glassware in the organic chemistry laboratory is that the joints can quickly and easily fit to other apparatus so that various reactions can be conducted from these various assembling of apparatuses.

Explanation:

Ground glass is glass whose polished surface has been ground to produce a rough finish.

Most organic chemistry laboratory glasswares are designed with ground glass joints. The joints are leak-tight and have outer (female) and inner (male) joints that can be tightly connected together.

These glassware are very important in the organic chemistry laboratory because they can be assembled and disassembled for various reactions conducted in the laboratory without having to have a specific custom-made glassware for each reaction or synthesis process performed in the laboratory. For example, a Liebig condenser can be used for various distillation reactions in the laboratory due to its joint that can be fitted to other apparatus in these reactions.

Also, ground glassware joints are chemical resistant and heat resistant unlike corks or rubber bungs and glass tubes.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate