Potassium Nitrate Ingredients
- 40 g ammonium nitrate (from an instant cold pack which has ammonium nitrate listed as its ingredient)
- 37 g potassium chloride (sold as a salt substitute, with potassium chloride listed as the ingredient)
- 100 ml water
NH4NO3 + KCl → KNO3 + NH4Cl
- Dissolve 40 g of ammonium nitrate into 100 ml of water.
- Filter the solution through a coffee filter to remove any undissolved material.
- Heat the solution with 37 g potassium chloride to dissolve the lite salt. Do not boil the solution.
- Filter the solution and either set it in the freezer to chill or else put it in an ice bath so you can observe the crystallization of the potassium nitrate.
- Pour off the ammonium chloride solution, leaving the potassium nitrate crystals. You can recover the ammonium chloride, too, if you like.
- Once the potassium nitrate crystals are dry, you can use them for chemistry experiments. The resulting potassium nitrate does contain impurities, but it will work fine for pyrotechnics projects and other experiments described on this site.