During your lab on pigments, another group mixed the following chemicals in their attempt to form...
During your lab on pigments, another group mixed the following chemicals in their attempt to form a new precipitate Hg2(NO3)2 (aq) Pb(NO3)2 (aq) and Ba(NO3)2 (aq). Nothing happened. SO they added (yes, to the mixture that already had three chemicals!) another chemical: NaBr (aq). A precipitate formed. What was it?
a) Hg2Br2
b) PbBr2
c) BaBr2
d) Two of the above
e) All three of the above
Homework Answers
a) Hg2(NO3)2 (aq) + 2NaBr (aq) ----> Hg2Br2(s) + 2NaNO3(aq)
Precipitate
b) Pb(NO3)2 (aq) + 2NaBr (aq) ----> PbBr2(s) + 2NaNO3(aq)
Precipitate
c) Ba(NO3)2 (aq) + NaBr (aq) ----> BaBr2(aq) + 2NaNO3(aq)
This shows that two of the above (option D) i.e. Hg2(NO3)2 (mercurous nitrate) and Pb(NO3)2 (lead nitrate) form precipitate with NaBr (sodium bromide).
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