question archive The next 2 questions concern the reaction: 2 H+(aq) + 2 CrO4 -2(aq)(yellow) ->Cr2O7 -2(aq) + H2 O (orange) 3) If a few drops of Pb(NO3 )2 solution are added to the equilibrium above, a yellow precipitate of PbCrO4(s) forms
The next 2 questions concern the reaction: 2 H+(aq) + 2 CrO4 -2(aq)(yellow) ->Cr2O7 -2(aq) + H2 O (orange) 3) If a few drops of Pb(NO3 )2 solution are added to the equilibrium above, a yellow precipitate of PbCrO4(s) forms
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The next 2 questions concern the reaction:
2 H+(aq) + 2 CrO4 -2(aq)(yellow) ->Cr2O7 -2(aq) + H2 O (orange)
3) If a few drops of Pb(NO3 )2 solution are added to the equilibrium above, a yellow precipitate of PbCrO4(s) forms. Which of the following occurs when a few drops of HNO3 are now added to this system? Explain your answer. (1 mark)
a) A ppt. of Cr(NO3 )2 forms.
b) A ppt. of Pb(NO3 )2 forms.
c) More PbCrO4 forms.
d) Solution turns yellow.(s) dissolves.
e) Some PbCrO4(s) dissolves.
4) A few drops of 6 M HNO3 are added to 10 mL. of 0.1 M K2Cr2O7. When a few drops of 0.1 M Sr(NO3)2 are added to this solution, no ppt. of SrCrO4 is formed. Which of the following changes might cause a ppt. of SrCrO4 to form? Explain your answer. (1 mark)
a) Add 6 M NaOH to reduce H+.
b) Add 6 M HCl to increase H+.
c) Dilute solution with pure H2O.
d) Add a few drops of 0.1 M NaNO3.
e) Add a few more drops of 6 M HNO3.
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