Step-by-Step Guide to Preparing Aqua Regia for Dissolving Gold

 

Aqua regia is a highly corrosive mixture of nitric acid and hydrochloric acid. It is commonly used to dissolve gold and other noble metals. Here is a step-by-step guide on how to prepare aqua regia:

Materials you will needa:

• Nitric acid (HNO3)
• Hydrochloric acid (HCl)
• Glass beaker
• Glass stirring rod
• Safety gloves
• Safety goggles
• Ventilation hood

Step 1: Wear appropriate safety gear

Nitric acid and hydrochloric acid are highly corrosive substances. You should wear protective gloves, safety goggles, and work in a well-ventilated area to avoid inhaling harmful fumes.

Step 2: Measure the correct amounts of nitric acid and hydrochloric acid

Aqua regia is prepared by mixing concentrated nitric acid and hydrochloric acid in a ratio of 1:3. For example, you could use 1 milliliter of nitric acid and 3 milliliters of hydrochloric acid.

Step 3: Pour the nitric acid into a glass beaker

Pour the measured amount of nitric acid into a glass beaker. It is important to use a glass beaker because nitric acid can corrode other materials.

Step 4: Add the hydrochloric acid to the beaker

Slowly pour the measured amount of hydrochloric acid into the beaker containing the nitric acid. Be sure to add the hydrochloric acid slowly and with caution, as the mixture can produce harmful fumes.

Step 5: Mix the solution

Stir the solution using a glass stirring rod. You will notice that the solution will turn yellow in color and produce fumes. It is important to avoid inhaling the fumes and work in a well-ventilated area.

Step 6: Store the solution

Aqua regia is a highly reactive solution and should be stored in a glass container with a tight-fitting lid. You should also label the container clearly to avoid accidental ingestion.

Conclusion:

Preparing aqua regia requires proper safety precautions and should only be done by experienced individuals. It is important to follow the correct ratio of nitric acid to hydrochloric acid, as well as work in a well-ventilated area and wear appropriate safety gear. With these precautions in mind, you can prepare aqua regia for use in dissolving gold and other noble metals.