1. you covered the top of the buret with a beaker to protect ...

The reason why a rubber stopper was not used to cover the top of the buret is that it would have interfered with the measurement of the contents inside the buret. Rubber stoppers can create a vacuum seal, which can prevent the flow of liquid or gas through the buret. This would have made it difficult to accurately measure the amount of liquid or gas being dispensed from the buret.

Instead, a beaker was used to cover the top of the buret. This allowed the contents of the buret to be protected from air, while still allowing for the flow of liquid or gas through the buret. The beaker was placed on top of the buret, creating a loose seal that allowed air to escape while still providing a barrier against contamination.

In summary, a rubber stopper was not used to cover the top of the buret because it would have interfered with the measurement of the contents inside. Instead, a beaker was used to provide protection from air without obstructing the flow of liquid or gas through the buret.

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