Sodium acetate or hot ice is an amazing chemical you can prepare yourself from vinegar and baking soda. You can cool a solution of sodium acetate below its melting point and then cause the liquid to crystallize. The crystallization is an exothermic process, so the resulting ice is hot. Solidification occurs so quickly you can form sculptures as you pour the hot ice.
Here is the reaction between the baking soda and vinegar to produce the sodium acetate:
Na+[HCO3]– + CH3–COOH → CH3–COO– Na+ + H2O + CO2
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