It is known that when two bodies at different temperatures are kept in contact, heat flows from the body of higher temperature to the one at lower temperature until both acquire same temp.In this case the heat energy associated with water at 80 degree celsius will be used up by ice to melt. And we know, temperature will not change during phase transition. So, on mixing the temp. should remain at 0 degree celsius.
It is known that when two bodies at different temperatures are kept in contact, heat flows from the body of higher temperature to the one at lower temperature until both acquire same temp.In this case the heat energy associated with water at 80 degree celsius will be used up by ice to melt. And we know, temperature will not change during phase transition. So, on mixing the temp. should remain at 0 degree celsius.