Hey hey! Could I please get an answer for this? I don’t really get prep. phrases

How does the author use structure to create tension in the excerpt

The english language has the largest vocabulary of any language in existence. it has close to a million words! the english language is also the most widely used language in the world. close to a billion speakers, at least half of which speak english as a second or foreign language. this unit takes you on a brief tour of the history of english, showing you how the language moved from its obscure beginnings to its celebrated status as the first truly global language. what is the main idea in the text?

You need to start an experiment and the instructions are to mix 2 g of sodium bicarbonate with 50 ml of distilled water and then mix the solution. describe what lab apparatus you would use and what safety precautions you must observe when completing this experiment.