83 General Chemistry I Laboratory Manual, 2017 Revision 4) Why might a student o

Question

83 General Chemistry I Laboratory Manual, 2017 Revision 4) Why might a student obtain a percent yield less than 100% for this preparation? 5) Copper metal reacts with dilute nitrie acid by the following reaction. If this reaction took place rather than the first reaction, would your yield of CuCl be affected assuming you started with the same amount of copper metal? Explain your answer 6) Could we use HCI to dissolve the copper metal instead of nitric acid in the first reaction? Explain your answer. 7) Given the following three sequential reactions: 1) Ndg) + 3H2(g) 2NH3(g) 2) 4NH3(g) + 5018) 4N0(g) + 6H20g) 3) 2N0(g) + 02(g) 2NO2(g) What mass of hydrogen gas is needed to produce 147.0 kg of nitrogen dioxide?

Explanation / Answer

4) Most gravimetric analyses give the product in less than 100% yield. This is due to the fact that a gravimetric analysis involves a number of precipitation and dissolution steps. An inherent disadvantage of the method is that small amounts of the precipitates are lost at each step of the reaction. The loss sums up at the end of the reaction and hence, the percent yield is always less than 100%.

5) I need to know the experimental procedure to answer this question.

6) Cu doesn’t react with HCl. This is due to the fact that Cu has a standard reduction potential lower than that of H+/H2. Therefore, Cu cannot displace H2 from HCl and hence, Cu doesn’t dissolve in HCl.

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