Question

a teacher is doing an acid - base reaction. she has 25.00 ml of hydrochloric acid of unknown concentration in a flask. she wants to add a base solution to the acid drop by drop, until all the acid has reacted. what tool would be best for adding the base solution dropwise and for most precisely measuring the volume of solution added?
a graduated cylinder
an eye dropper
a beaker
a buret

Explanation:

A graduated cylinder is a common laboratory tool used for precisely measuring the volume of liquids. An eye - dropper is mainly for dispensing small amounts drop - by - drop but not for accurate volume measurement of larger quantities. A beaker is used for general holding and mixing of liquids and has less accurate volume markings. A buret is a highly accurate device for dispensing precise volumes of liquid drop - by - drop and is ideal for titrations like the one described here.

Answer:

D. a buret