We performed the Friedrich Wohler\'s synthesis reaction where urea was produced
ID: 1052372 • Letter: W
Question
We performed the Friedrich Wohler's synthesis reaction where urea was produced from two inorganic compounds that are silver cyanate and ammonium chloride. The overall reaction is as follows:
Ag(OCN) + NH4Cl(aq) ---> AgCl(s) + H2NCONH2(aq)
I am just curious to know the reactions that occurred during the experiment. Read the procedure and answer the question in bold, please!
1)First, NH4Cl was mixed with H2O in a test tube. Purpose? dissociate NH4Cl into NH4+ and Cl-, is this true?
2)Then in a 25mL beaker, we mixed silver cyanate with water (AgOCN) and the solution precipitated. What is the purpose of this step? Explain with an equation, please!
3) mixtures from step 1 and 2 were mixed and we performed filtration. The filtrate was kept but the PPT was discarded (it contained AgCl solid). What are the products in the filtrate?
4) The filtrate was heated in a sand bath and the mixture was left to cool down. We then performed vacuum filtration to collect the filtrate and discard the crystals. What is the purpose of this step?
5) we heated the filtrate one last time and recrystallized it, but this time we kept the crystals.
Melting point of the final product is low due to impurities, can you give me examples of impurities present in the final product?
Explanation / Answer
1. Yes the purpose is same. you must provide a solvent to carry out reaction. The two reactant must come contact two reacts.
2. AgOCN --> Ag+ aq + -OCN aq thus dissociation is purpose of second step.
NH4CL ---> NH4+ aq + Cl- aq
3. -O-CN aq + NH4+ ---> NH4+ -N=C=O is the product in filtrate.
4. NH4+ -N=C=O . -----> Nh2-CO-Nh2 (Urea)
the crystals formed in first setps are of AgCl so discarde.
The crystals formed in second step are of urea so kept.
Impurities may be Nh4CL or dissolved AgCl
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