At 0oc, what is the state or states of the water in the beaker?

solution;

Both water and ice can exist at 0° C at 1 atm of pressure.  

It depends on the progress of melting as to which phase it is.  

If they use the word "water" and say "water at 0 Celsius", what they mean is liquid water.  

If they use the word "ice" and say "ice at 0 Celsius", what they mean is solid water ice.

At 0ºC the water is presented in its solid state.

Explanation:

On the celcius temperature scale (ºC), water appears in its solid state when the temperature reaches 0ºC, that is, the water turns to ice. On that same scale, water starts to enter its gaseous state, when the temperature reaches 100ºC.

In this process, we can see that at lower temperatures the water starts its solidification process and at high temperatures, it starts the boiling process.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error