The baking soda and vinegar recipe abounds somewhere. Have you checked under sodium acetate?
Cold
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.
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.
The ice melts and the water gets cooler.
In a perfectly-insulated container, with a perfectly-insultated cover, all the energy of the hot water is distributed between the hot water and the ice cube. As the ice cube melts, this statement is still true, but the ice's latent heat of fusion may draw the hot water down to near freezing point, even if its mass is small compared to the mass of hot water.
Wikipedia and NHL.com for statistics
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