You made a 100.0 ml of a lead(ii) nitrate solution for lab but forgot to cap it. the next lab session you noticed that there was only 80.0 ml left (the rest had evaporated). in addition, you forgot the initial concentration of the solution. you decide to take 2.00 ml of the solution and add an excess of a concentration sodium chloride solution. you obtain a solid with a mass of 3.407 g. what was the concentration of the original lead(ii) nitrate solution?

Yasmin's teacher asks her to make a supersaturated saline solution. her teacher tells her that the solubility of the salt is 360 g/l at room temperature (25 °c). how can yasmin make a supersaturated saline solution? she can add 380 g of salt to 1 l of hot water (75 °c) and stir until all the salt dissolves. then, she can carefully cool the solution to room temperature (25 °c). she can add 360 g of salt to 1 l of room temperature water (25 °c) and stir the solution until all the salt dissolves. she can add 380 g of salt to 1 l of cold water (5 °c) and stir the solution until most of the salt dissolves. then, she can carefully heat the solution to room temperature (25 °c). she can add 380 g of salt to 1 l of room temperature water (25 °c) and let the solution sit for 24 hours, so the salt dissolves.