Methods For Salt Preparation

Explanation
The correct answer is "Acid reaction with excess base/ carbonate/ metal." This method involves reacting an acid with an excess amount of base, carbonate, or metal. The acid and base react to form a salt and water, while the acid and carbonate react to form a salt, water, and carbon dioxide gas. In both cases, the salt formed is AgNO3. This method is commonly used in the laboratory to prepare silver nitrate.

Explanation
Titration is a method used to determine the concentration of a solution by reacting it with a solution of known concentration. In this case, to prepare sodium iodide (NaI), titration would be the most suitable method. It involves reacting a solution containing iodine with a solution of sodium hydroxide (NaOH) of known concentration until the reaction is complete. The point at which the reaction is complete is determined by using an indicator, such as phenolphthalein, which changes color when the reaction is finished. By measuring the volume of the NaOH solution required to react with the iodine solution, the concentration of the iodine solution can be determined and used to prepare sodium iodide.

Explanation
The correct answer is "Precipitation." This method involves the formation of a solid precipitate, PbCl2, by mixing a lead-containing solution with a chloride-containing solution. The reaction between the lead ions and chloride ions results in the formation of the insoluble PbCl2 compound, which can be separated from the solution by filtration. This process is commonly used to prepare various inorganic compounds, including PbCl2.

Explanation
The correct answer is "Acid reaction with excess base/ carbonate/ metal." This method involves reacting an acid with an excess amount of base, carbonate, or metal to form FeSO4 through a precipitation reaction. The acid reacts with the base, carbonate, or metal to form FeSO4 and water. This method is commonly used to prepare FeSO4 in the laboratory.