posted by Raj on .
I have to do lab experiment where I design a procedure to determine the identity of two unknowns given to me. One will be a solid and one will be a solution. I also have to quantify the amount of solute in the solution. The possible solids it could be are NaCl, KNO3, KHP, Zn, Ca, Mg, CuO, or ZnO. The possible solutions it could be are NaCl, CaCl2, CuSO4, NaOH, Ba(OH)2, HCl, HNO3, or H2O. We will only be provided with 3-4 mL solution.
Also, the reagents we will be provided with are NaOH, HCl, AgNO3, Zn Metal, Na2SO4, and H2O.
Some general materials provided will be materials for titrations, test tubes, flasks, hot plates, etc.
Can someone please help me out with this?
The idea here is to apply what you have learned about ions/compounds, etc, put all of that together to come up with a scheme for determining which is which in an unknown. You don't say how accurate the quantification is to be.
Some general ideas for a solid:
Ca and Mg are soft and will react with water (Mg with hot water) to produce hydrogen gas and a basic solution. The metal Zn may have a metallic luster or it may be black if powdered. At any rate, Zn will react with an acid to produce hydrogen gas but it will not react with water (which differenctiates it from Ca and Mg). CuO will likely be colored, the others are white crystals or solids. NaCl, KNO3, and KHP are soluble in water. CuO and ZnO are not soluble. I trust this will get you started. I don't want to spoil the fun you can have by doing this yourself.
But can you tell me what this means "quantify the amount of solute in the solution".
Qualitative analysis is what you are doing when you identify the ions or compounds in solid or in solution. To quantify means you want to tell them how much of the material your were given; i.e., a concentration or the number of grams.