Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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A student performed the five step reaction to produce copper (I) chloride as outlined in the CHM 125 lab manual. The following reactions were performed:
- Cu(s) + 4 HNO3(aq) → Cu(NO3)2 (aq) + 2NO2 (g) + 2 H2O (l)
- 2 HNO3(aq) + Na2CO3 (s) → H2O (l) + CO2 (g) + 2 NaNO3 (aq)
- Cu(NO3)2(aq) + Na2CO3 (s) → CuCO3 (s) + 2NaNO3 (aq)
- CuCO3(s) + 2 HCl (aq) → CuCl2 (aq) + H2O(l ) + CO2 (g)
- CuCl2(aq) + Cu (s) → 2 CuCl (s)
The student weighed out 1.245 g of Cu (s) and added 5.3 mL of 15.8 M nitric acid. The student then added 3.911 g of Na2CO3 (s) to the mixture to carry out reactions 2 and 3 at the same time. Based on this information and the reactions 1-5 answer the following questions:
a.Using equation 1 calculate the total number of moles of HNO3 added. Next calculate how many moles of HNO3 were added in excess
- Based on the moles of HNO3 calculated in the previous step and also the number of moles of Cu(NO3)2 produced in reaction 1 calculate the total mass of Na2CO3 needed for steps 2 and 3. Was the amount of Na2CO3 added in excess or was it inadequate? By how much was it in excess or limited?
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