What is a reasonable discussion of the method for the preparation of a sample of lead iodide and hygrated copper sulphate?

You need to rephrase your question so it makes more sense. For example, the preparation of PbI2 and CuSO4.5H2O from what. What do you mean by discussion. Do you want a procedure?

which elements are in H2S

Your question, when posted piggy back style on another, is likely to get ignored. In the future, post your own question by going to the top of the page, click on Post a New Question and type in your question. The answer to your question is H2S contains two elements, hydrogen and sulfur.

To have a reasonable discussion about the method for the preparation of a sample of lead iodide and hydrated copper sulfate, we need to consider the individual preparation methods for each compound.

1. Lead Iodide (PbI2):
- Start by wearing appropriate safety gear, such as gloves and safety goggles.
- Take a suitable container, preferably glass, and add a measured amount of lead(II) nitrate (Pb(NO3)2) to it. The specific amount would depend on the desired quantity of lead iodide.
- Next, slowly add a measured amount of potassium iodide (KI) solution to the container while stirring continuously. The reaction between lead(II) nitrate and potassium iodide yields lead iodide as a solid precipitate and potassium nitrate as a soluble byproduct.
- Continue adding the potassium iodide solution until no more precipitate forms.
- Allow the mixture to settle for a while, allowing the lead iodide to precipitate to the bottom of the container.
- Carefully decant the liquid (containing potassium nitrate) from the container, leaving the solid lead iodide behind.
- Rinse the remaining solid with distilled water to remove any remaining impurities.
- Finally, dry the lead iodide by placing it in an oven at a low temperature or allowing it to air dry.

2. Hydrated Copper Sulfate (CuSO4·xH2O):
- Again, ensure you are wearing appropriate safety equipment.
- Take a suitable container and measure out a specific amount of copper sulfate crystals (CuSO4). The quantity will depend on how much hydrated copper sulfate you want to prepare.
- Place the crystals in the container and add a measured amount of water to dissolve the crystals. The amount of water can vary, but it is advisable to add the minimum amount required to dissolve all the crystals.
- Stir the mixture until all the crystals have dissolved.
- If you want to obtain a specific hydrated form of copper sulfate (e.g., pentahydrate, CuSO4·5H2O), you can heat the solution gently while stirring until the desired crystal form precipitates out. The remaining water can then be decanted or filtered as needed.
- Allow the mixture to cool down and dry. You can use gentle heating or simply leave it in open air to facilitate the evaporation process.
- Once the sample is dry, you can store it in a suitable container for future use.

It is important to note that these methods should be performed by individuals with proper knowledge and experience in handling chemicals and laboratory procedures. Additionally, always follow safety guidelines and regulations when working with potentially hazardous substances.