Question

what is generally the best approach when liquid from a large reagent bottle is needed in an experiment? select one

insert a pipet into the reagent bottle as many times as needed to get the desired amount of liquid

pour some of the reagent from the bottle into a beaker, then use as needed in the procedure

dispense the liquid directly from the reagent bottle whenever it is needed

pour liquids directly from a reagent bottle only when a funnel is placed securely underneath

Explanation:

Pouring some reagent from the bottle into a beaker first helps prevent contamination of the large - volume reagent in the bottle. Inserting a pipet multiple times and dispensing directly from the bottle can introduce contaminants. Using a funnel doesn't address the contamination issue when pouring directly from the bottle.

Answer:

Pour some of the reagent from the bottle into a beaker, then use as needed in the procedure