posted by jisun on .
Four bottles, labeled A through D, each containing about 5 grams of finely powdered white substance are found in a lab. Near the bottles are four labels specifying high purity and indicating that substances are glucose (C6H12O6), sodium chloride (NaCl), aluminum oxide (Al2O3), and zinc sulfate (ZnSO4). These labels belong to the bottles and each bottle has only one substance.
Describe tests you would use to help find which label goes to which bottle. Then figure out what substance actually goes to which of the four bottles and explain.
I'm so confused on how to do this. Please help me asap! THANKS!!!
What do you know about the properties of these four substances?
Glucose, NaCl, and ZnSO4 are soluble in water. Al2O3 is not. One down.
Of the solutions, glucose does not conduct electricity. NaCl and ZnSO4 do. Two down.
ZnSO4 + NaOH produces Zn(OH)2, an insoluble ppt. NaCl has no reaction with NaCl. Three and four down.
Post any questions you have about this process. It is important that you are able to apply chemical knowledge about ions and compounds in solution. In the old days we taught qualitative chemistry. Qualitative analysis is not emphasized these days.
So would all I need to solve this is to know the solulubility rules?