The following results, were obtained through a series of two experiments: Experi
ID: 512515 • Letter: T
Question
The following results, were obtained through a series of two experiments:
Experiment 1: Reactions with acids
Cr (S)
Ag (S)
HCl
Metal dissolves, bubbles, green solution
No apparent reaction
H2SO4
Metal dissolves, bubbles, bluish purple solution
No apparent reaction
Experiment 2: Replacement reactions
Cr2+ + Ag metal: no apparent reaction, silver metal did not change, solution stayed green
Ag+Cr metal: silvery solid formed on piece of Cr metal. Solution went from colorless to bluish-green.
a) Explain the color changed observed in Experiment 2 (replacement reactions)
b) Discuss the relative activities of silver and chromium.
Cr (S)
Ag (S)
HCl
Metal dissolves, bubbles, green solution
No apparent reaction
H2SO4
Metal dissolves, bubbles, bluish purple solution
No apparent reaction
Explanation / Answer
a) Addition of silver metal did not change colour and the Cr2+ solution stayed green solution stayed green. However, when Chromium metal was added to Ag+ solution, a silvery solid of Ag metal formed on piece of Cr metal and the solution went from colorless to bluish-green.
It indicates that the chromium metal is able to replace replace silver from the solution.
Cr(s) + 2Ag+(aq) Cr2+(aq) + 2Ag(s)
b) The above observation also indicates that Chromium is relatively more active than the silver.
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