Usually, to dissolve a salt, we need a particular pH. So, check the pH requirement for the salt you are using. By adjusting the pH, you can dissolve that particular salt. Additionally, some salts need a specific temperature to dissolve. After dissolution, you can store the solution at room temperature or the temperature required to store that particular solution. So, whenever you want to prepare a solution, you should first check its dissolution parameters. Then, you can start preparing the solution. Wish you all the best!