Prior to the lab: A plan should be constructed in which you address the followin

Question

Prior to the lab: A plan should be constructed in which you address the following questions in order for you to successfully complete this experiment. The typed and printed answers to these questions must be submitted in order to be allowed into the lab 1. 2. 3. What are the melting points and safety concerns associated with the use of copper and sulfur? What are the most plausible formulas for copper sulfide produced as a result of this synthesis? If the elements do not react upon initial contact, how do you plan to initiate the chemical reaction? 4. Which is preferable in the reaction vessel: excess copper or excess sulfur? Why is the element you have chosen more preferable to have in excess if the experiment is being done gravimetrically? a. b. How do you plan to remove the excess reactant? What safety concerns need to be addressed in order to safely remove your excess? Detail safety concerns of working with copper, and working with sulfur in open air at high temperature. This information can be found by searching for sulfur and copper MSDS information a. b.

Explanation / Answer

Melting point of copper is 1085 C, while using copper following safety should be taken.

a) no open flames

b) breathing protection, protective gloves, protective googles

Melting point of sulphur is 115 C, following safety should be taken while using sulphur

a) sulphur is flammable, so avoid fire

b) it’s vapours and dust may be explosive

c) sulphur may generate hazardous amount of hydrogen sulphide

2) Most plausible formula is Cu2S or CuS, depending upon temperature of the reaction, mostly it remain as CuS

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