This is a Temperature vs. Heat graph for water that includes the latent and specific heats as well as the equations used for each phase and phase change.
I always use this graph when doing heat calculation problems. I find it just makes "visualizing" the calculation steps a lot easier if we can "walk up (or down)" the graph as we calculate the heat added or released as water changes temperature and phase.
I have also included a black and white version that will copy better. :)