Chemistry Gr12 Question

For each of the following situations, identify those for which a reaction is likely to occur. For those that do occur, write a net ionic equation.
a) chromium dipped into silver nitrate
b) gold immersed in hydrochloric acid
c) nickel pellets dropped into calcium acetate, Ca(C2H302)2
d) aluminum dropped into a bath of sulphuric acid
e) zinc dipped into a solution of lead(II) nitrate

Reaction will occur only if the metal added is HIGHER in the activity series than that in soln…see en.wikipedia.org for examples.

a) Cr(s) + 3AgNO3(aq) —> 3Ag(s) + (Cr+++)(NO3-)3
b) NR
c) NR
d) 2Al(s) + 3H2SO4(aq) —> 3H2(g) + (Al+++)2(SO4–)3
e) Zn(s) + Pb(NO3)2(aq) —> Pb(s) + (Zn++)(NO3-)2

For practice, find a good activity chart and make up your own experiments.
You will find that gold is v low in the series, so is often recovered in production by adding iron or copper to the soln; what other cheap metals could you use?

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