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As you chill the mixture, potassium nitrate readily solidifies. Ammonium chloride is more soluble, so it remains in solution. Even though the solution is on ice or in the freezer, it won't freeze because the particles cause freezing point depression of the water. This is why these chemicals can be used to de-ice roads! Keep in mind, the potassium nitrate you get from the reaction won't be reagent-grade purity.

However, it should be pure enough for most chemistry experiments and fireworks projects. Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile. Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights. Measure content performance. Develop and improve products. List of Partners vendors.

Share Flipboard Email. Anne Marie Helmenstine, Ph. Chemistry Expert. Helmenstine holds a Ph. She has taught science courses at the high school, college, and graduate levels. Facebook Facebook Twitter Twitter. Its use as a food preservative dates to the Middle Ages. Fireworks, gunpowder, matches and blasting powders represent incendiary products containing this salt. Rocket fuel may also contain potassium nitrate. The salt proves useful in tempering steel and manufacturing glass.

Potassium nitrate also features in dental research, and the chemical industry relies upon potassium nitrate for temperature maintenance around reactors, as well as for making other chemicals. Stored heat is further used to generate steam for electricity production. This molten salt mixture provides sensible heat storage due to its high thermal stability, low cost and low vapor pressure. She spent nine years working in laboratory and clinical research. A lifelong writer, Dianne is also a content manager and science fiction and fantasy novelist.

Dianne features science as well as writing topics on her website, jdiannedotson. Alternative Solvents to Benzene. How to Make Calcium Carbide.

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