Yes, Molarity is moles of solute/liter or solution. When I calculate the mass of aluminum chloride needed for 5mL of a 3M solution, I get a different number. Can you post your calculations so I can see what went wrong?
To calculate the masses of sodium hydroxide and ammonium hydroxide you need you would first need to specify the volume of solution you want.
I basically fiddled with the numbers a little to come up with an answer... any answer. I needed to feel that I've done something for the day. Haha. Please excuse silly, juvenile mistakes.
5 mL= .005 L
.005 L x 3 moles/1 L = .015 moles of Aluminum Chloride (160.32208 g Aluminum Chloride/ 1 Mole of Aluminum Chloride)= 2.40 g Aluminum Chloride?
I think I will be given the solutions ready to use, but I just have to specify how much of each I need. We will basically submit an order form of the chemicals that are required to execute the lab. Included in the "order form" are the solutions and how much of each will be needed and the lab equipment which isn't a problem. Also, the Aluminum Chloride will be in a solid form, I believe, while the sodium hydroxide and ammonium hydroxide solutions will be liquid.