If a catalyst is introduced to ecxellaerate decomposition of Hydrogen Peroxide with the the aid of a condenser and another bottle theat is connectect to the first. This second bottle contains displaced water(bottle of water inverted to leaving an air pocket at top to take in the O2 through tubing that draws the oxygen in from the bottle that is upright(containing the catalyst and hydrogen peroxide): The hyrogen peroxide will decompose into water and oxygen. In this process there are five bottles used to collect the oxygen. The question is for those bottles left uprght.What is the purpose and why are they left upright? Is it to maintain an equilibrium of pressure etc.? Is the gas collected in O2 form volitale even though it is being mixed with the air that was already present before the O2 was collected from the process of decomposing thr hydrogen peroxide.Or! Is the questiin as simple as making a comparison that the is no water in them as there was in the first and no need to displace water to create a suctioning effect?

See my response to your previous post. (1 below this one)

The purpose of leaving the bottles upright in the described setup is primarily to collect the oxygen gas that is being produced during the decomposition of hydrogen peroxide. By leaving the bottles upright, the gas can be readily collected in the headspace of each bottle.

When the hydrogen peroxide decomposes, it forms water and oxygen as byproducts. Since the water is collected in the first bottle, it effectively displaces the air inside. The oxygen gas produced during the reaction then travels through a tubing system and enters the second bottle (and subsequent bottles) which are left upright.

The reason for using multiple bottles is to collect as much oxygen as possible. As the gas flows through the tubing, it enters each consecutively placed bottle, filling up the headspace. By leaving them upright, the oxygen can be easily trapped in each bottle, allowing for larger quantities to be collected.

Regarding the nature of the collected gas, it is primarily oxygen. Though it may mix with the existing air already present in the bottles, the majority of the gas inside would be oxygen. The purpose here is to separate and collect the oxygen from the other gases in the system.

To summarize, the reason the bottles are left upright is to collect the oxygen gas produced during the decomposition of hydrogen peroxide. The upright position allows for easy trapping of the gas in each bottle, maximizing the collection of oxygen.