The baking soda and vinegar recipe abounds somewhere. Have you checked under sodium acetate?
If you put ice cubes in a bowl or whatever of hot water, the ice cube is sure to melt when put so says science.
No, hot water should not be used to make an ice rink. Cold water freezes faster and results in a smoother ice surface. Hot water can also create weak spots in the ice, making it less safe for skating.
Cold
No, you should not put hot water in an ice bag. Ice bags are designed to hold cold temperatures for treatments such as reducing swelling or numbing pain. Using hot water may damage the bag or cause it to leak.
When Ice melts, it does so using latent heat. In other words as you heat the Ice/water mixture, until all the Ice has melted the temperature of the mixture does not increase until all the Ice has gone. The energy goes into melting the Ice and this is called the latent energy. Thus if you add the same sized ice cube to same size classes of water but one of the glasses is filled with hot water, the ice in the hot water will melt faster because the heat of the water will be used for the latent heat of melting.
Wikipedia and NHL.com for statistics
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