Question

A student noted down the following precautions for the experiment “To verify the law of conservation of mass in a chemical reaction.”

The spring balance should be held vertical while in use.
Before making use of the spring balance it must be ensured that its pointer is at zero mark.
The reading of the balance should be noted only when its pointer comes to rest.
Mixing of two solutions should be done quickly.
Chemical reaction should be exothermic.
Which precautions need modifications?​

Answer 1

The reading of the balance should be noted when pointer is at rest and final motion