Chemical Reactions of Copper and Percent Yield

Chemical Reactions of Copper and Percent Yield - Chemical...

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Chemical Reactions of Copper and Percent Yield Karin Emanuelson & Ryan Kusy
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Pre Lab Questions: 1. A Redox reaction example is: NaCl (aq) + AgNO 3(aq) → AgCl (s) + NaNO 3(aq) A Metathesis reaction example is: NaCl (aq) + AgNO 3(aq) = AgCl (s) + NaNO 3(aq) 2. Metathesis reactions will proceed to completion when one of the compounds is removed from solution. Other reactions complete because one component is more difficult to oxidize than the other. 3. Percent yield is the percentage of mass recovered divided by the initial mass of a substance. 4. Six examples of separation are filtration, sedimentation, decantation, extraction, sublimation, and boiling. 5. Exothermic reactions becomes hot, as well the temperature of the substance must go down. Endothermic reactions increase the temperature of the substance, no heat is given off. 6. Cu (s) + 2HNO 3(aq) → Cu(NO 3 ) 2(aq) + H 2(g) 2.09g Cu x (1 mol Cu) / (63.55g Cu) x (1 mol Cu(NO 3 ) 2 ) / (1 mol Cu) x (187.57 g Cu(NO 3 ) 2 ) / (1 mol Cu(NO 3 ) 2 ) = 6.17g Cu(NO 3 ) 2 (3.40g Cu(NO 3 ) 2 ) / (6.17 g Cu(NO 3 ) 2 ) x 100 = 55.11% 7. The maximum percent yield of any reaction is 100% 8. Decantation : a process that separates mixtures where liquid is added to a substance, and carefully poured out. The liquid will carry the unwanted substance with it, leaving the desired substance in the beaker. Filtration: another method for separation by using filter paper, which the liquids can pass through but the solid cannot. It can also be considered any method of separating a solid from a liquid. 9. Cu (OH) 2 (s) → (heat) CuO (s) +H 2 O (g) 10. H 2 SO 4 (aq) + CuO (s) → CuSO 4 (aq) + H 2 O (l)
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Purpose: The purpose of this lab was to gain familiarity with basic laboratory procedures, transitions of a typical substance in chemistry into different states as well as solutions, and the concept of percent yield. Reference: Nelson, John H. and Kemp, Kenneth C. Laboratory Experiments to accompany Chemistry: The Central Science, 9 th ed. Upper Saddle River, NJ: Pearson Education, Inc., 2003. Balanced Chemical Equations: Cu (s) + 4 HNO 3 (aq) → Cu(NO 3 ) 2 (aq) + 2 NO 2(g) + 2H 2 O (l) Cu(NO 3 ) 2 (aq) + 2 NaOH (aq) → 2 NaNO 3 (aq) + CuOH 2 (s) Cu(OH) 2 → (heat) CuO (s) + H 2 O (g) CuSO 4 (aq) + Zn (s) → ZnSO 4 (aq) + Cu (s) CuSO 4 (aq) + Zn (s) → ZnSO 4 (aq) Cu (s) Hazards and Safety Issues: Goggles must be worn at all times Closed-toed shoes must be worn Be careful when using the Bunsen burner, do not stand directly over or near the burner when lighting or in use. Also watch that any flammable objects are not near the burner at anytime unless instructed by the teacher.
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Many of the substances may cause irritation or burning to the skin, so be careful when handling the substances. During chemical reactions, many hazardous fumes and vapors are produced. Do not stand near or
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This note was uploaded on 05/02/2010 for the course ECON 4428 taught by Professor Dr.siwak during the Spring '10 term at Drew.

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Chemical Reactions of Copper and Percent Yield - Chemical...

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