How do I determine the mass of zinc iodide from the filtration of a zinc iodide solution?
Because zinc iodide is soluble in water, you need to let the water evaporate until the zinc iodide is completely dry. You can do this more quickly in a drying oven, if one is available. To be sure the zinc iodide is completely dry, you should take the mass several days in a row until the mass is consistent. Hopefully you determined the dry, empty mass of the container, so you can subtract its mass from the mass of the container plus the zinc iodide. This will give you the mass of the zinc iodide.