Silver nitrate is a commonly used chemical reagent, often used in the preparation of other silver compounds, as well as as analytical reagents, photographic developers, etc. However, impurities in silver nitrate may affect its application effect, so it is very necessary to purify the silver in silver nitrate.
1. Prepare reagents and equipment: The required reagents and equipment include silver nitrate solution, deionized water, glass rod, filter paper, filter funnel and hot plate.

2. Preparation of precipitation: First add the silver nitrate solution dropwise into deionized water, while stirring with a glass rod until the silver nitrate is completely dissolved. Then slowly add sodium hydroxide solution until a brown precipitate appears in the solution. At this time, attention needs to be paid to controlling the speed of adding sodium hydroxide to avoid overreaction of the solution.

3. Filter the precipitate: Pour the reaction mixture into a filter funnel and filter the precipitate with filter paper. Wash the precipitate several times with deionized water until the washing liquid becomes neutral.

4. Dry the precipitate: Pour the washed precipitate onto the hot plate and dry it over medium heat. At this time, constant stirring is required to prevent the sediment from clumping during the drying process.

5. Preserve pure silver: Store the dried silver precipitate in a dry container to prevent it from getting wet and contaminated.

Through the above steps, the silver in silver nitrate can be purified simply and quickly.