Question

what is generally the best approach when liquid from a large reagent bottle is needed in an experiment? select one: ○ 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. ○ pour some of the reagent from the bottle into a beaker, then use as needed in the procedure. ○ insert a pipet into the reagent bottle as many times as needed to get the desired amount of liquid.

Explanation:

• Dispensing directly from the reagent bottle (first option) risks contamination and inaccurate measurement.
• Using a funnel (second option) doesn't address contamination or proper handling for repeated use.
• Inserting a pipet multiple times (fourth option) contaminates the reagent in the bottle.
• Pouring some reagent into a beaker (third option) allows safe, repeated use without contaminating the stock bottle, as the beaker is used for the needed amount, keeping the main reagent pure.

Answer:

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