Endothermic reaction. Dissolution of ammonium nitrate (NH4NO3) in water is an endothermic reaction, i.e. the energy is absorbed from the surroundings: NH4NO3 -> [NH4]+ + [NO3]-. Here 30 g of ammonium nitrate is added to a beaker with 120 mL of water, initially at 25 degrees Celsius (left frame). After ammonium nitrate is dissolved, the temperature drops to 12.7 degrees Celsius (right frame).
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TOP22304608
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達志影像
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