Chlorine gas was bubbled through a warm concentrated solution of potassium hydroxide.
-write an equation of reaction that took place
-describe how pure crystals potassium chlorate (5) may be obtained from the reaction above
Not now
The reaction between chlorine gas (Cl2) and potassium hydroxide (KOH) can be represented by the following equation:
2 KOH + Cl2 -> KCl + KClO3 + H2O
Now, let's dive into the process of obtaining pure crystals of potassium chlorate (KClO3) from this reaction:
1. Reaction: The first step is to bubble chlorine gas through a warm, concentrated solution of potassium hydroxide. This reaction oxidizes the chloride ions (Cl-) in the KOH solution to form potassium chloride (KCl) and potassium chlorate (KClO3) while generating water (H2O) as a byproduct.
2 KOH + Cl2 -> KCl + KClO3 + H2O
2. Filtration: After the reaction, you'll have a mixture containing the desired product, potassium chlorate, along with potassium chloride and water. To separate them, you can use filtration. Pass the mixture through a filter paper or a filtration apparatus to separate the solid potassium chloride from the remaining solution.
3. Crystallization: To obtain pure crystals of potassium chlorate, you need to evaporate the filtrate (the remaining solution that passed through the filter) carefully. Heat the solution gently until most of the water evaporates, leaving behind a saturated solution of potassium chlorate. As the solution cools, crystals of potassium chlorate will start to form.
4. Recrystallization: To ensure the purity of the potassium chlorate crystals, you can perform recrystallization. Dissolve the obtained crystals in a minimum amount of hot water, and then allow the solution to cool slowly. As the solution cools, the impurities will be excluded, and pure potassium chlorate crystals will form.
5. Collection: Once the crystals have formed, collect them by filtration or by carefully decanting the supernatant liquid (liquid remaining after crystals settle) and leaving the crystals to dry.
By following these steps, you can obtain pure crystals of potassium chlorate (KClO3) from the reaction between chlorine gas and a concentrated solution of potassium hydroxide.