Final answer:
The temperature of ice immediately after formation is 0°C. Ice and water can coexist at this temperature in a state of equilibrium, and in an insulated container with 0°C water, neither melting nor freezing will occur.
Step-by-step explanation:
The temperature of ice right after it is formed by freezing water is 0°C. Ice at this temperature is in equilibrium with water, meaning that the ice and water phase can coexist at 0°C without either instantly freezing or melting. If 0°C ice is placed into 0°C water in an insulated container, neither additional ice will melt nor will more water freeze, provided that the system is perfectly insulated and no external energy is added or removed. The presence of ice at 0°C in an insulated container with water indicates that a state of dynamic equilibrium is reached where the rate of melting equals the rate of freezing.
ice can absorb heat without changing temperature until it all turns to water; only after all the ice has melted can the temperature of the water increase above 0°C. This is a manifestation of the latent heat of fusion, which is the energy required to change the state from solid to liquid without changing its temperature.