What device is used to add chemicals to a reaction in a controlled manner?

What device is used to add chemicals to a reaction in a controlled manner?

• A. Dropping Funnel
• B. Addition Funnel
• C. Syringe
• D. Pipette

Answer: (B)

Adding reagents to a reaction in a controlled way relies on a tool that can meter flow precisely. An addition funnel is designed for this purpose: it has a stopcock at the bottom that lets you regulate exactly how fast the liquid drips into the reaction. This slow, steady delivery helps prevent sudden temperature spikes, reduces the risk of splashing or vigorous foaming, and keeps the reaction under better control, which is especially important during sensitive steps or reflux conditions. Other tools can perform related tasks but don’t offer the same combination of precise, adjustable flow and compatibility with a reaction setup. A dropping funnel can provide slow addition but is less precise in flow control. A syringe or pipette excels at transferring small, discrete volumes but isn’t ideal for continuous, timed addition into a reacting mixture, particularly over longer periods or under reflux. That balanced capability makes the addition funnel the best choice for controlled reagent addition.

Adding reagents to a reaction in a controlled way relies on a tool that can meter flow precisely. An addition funnel is designed for this purpose: it has a stopcock at the bottom that lets you regulate exactly how fast the liquid drips into the reaction. This slow, steady delivery helps prevent sudden temperature spikes, reduces the risk of splashing or vigorous foaming, and keeps the reaction under better control, which is especially important during sensitive steps or reflux conditions.

Other tools can perform related tasks but don’t offer the same combination of precise, adjustable flow and compatibility with a reaction setup. A dropping funnel can provide slow addition but is less precise in flow control. A syringe or pipette excels at transferring small, discrete volumes but isn’t ideal for continuous, timed addition into a reacting mixture, particularly over longer periods or under reflux. That balanced capability makes the addition funnel the best choice for controlled reagent addition.