Answer:
A measuring cylinder.
Explanation:
Why not a burette?
The burette is used for titration, to transfer the titrant drop by drop to find the sharp end point.
If we use a burette to measure 50 ml of acid, then it will take a lot of time to transfer it from the burette to the given sample solution.
Why not a conical flask?
Conical flasks can't be used for measuring the volume of any substance. There is no marking on the conical flask, so there are chances of error if we randomly pour the acid into the conical flask.
Why not a pipette?
The substance that we are adding is acid, and sucking acid from a pipette is a dangerous act, because acid can go into the mouth. Another reason is that the pipettes available in the laboratory are either 10 ml or 25 ml, so measuring 50 ml of acid from a pipette is a multi-task.
Why a measuring cylinder is the best piece of apparatus to measure 50 cm³ of acid?
In this the body is less likely to be harmed by acids. Along with this, the accuracy is also very high in it. The measuring cylinder can measure up to 50 ml acid at a time, so it is the best apparatus.
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