c. Based on your answer to question 2b above and the amount of aluminum metal yo
ID: 541381 • Letter: C
Question
c. Based on your answer to question 2b above and the amount of aluminum metal you used in your experiment, what was the limiting reagent in your reaction? Show your reasoning on your observations, propose an explanation for the fate of the excess reagent. Include a chemical equation if appropriate. 3. From your tests on individual ions, which of the reagents gave the most distinctive test for a·copper ions? b. aluminum ions? 4. When copper and aluminum ions are together, can each be clearly detected with one or more of your reagents? Which reagent(s) would be used for each ion? 84Explanation / Answer
2C. aluminium is the limiting reagent. as per balanced reaction 2 mole aluminium reacts with 3 mole cupper chloride and weight of aluminium predicts that it will finish first and it will limit the reaction.
d. excess reagent will remain unreacted.
3. a. Cupper ions: passing of H2S gas in HCl , there will be black colored precipitate of cupper sulfide
aluminium ion: addition of excess NH4OH in presence of NH4Cl, there will be precipitation of Al(OH)3 in white color.
4. if H2S passes through the solution there will be black color precipitation of cupper sulfide and then addition of NH4OH, there willl be geletanious precipitation of aluminium
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