posted by write2khin on .
1) All of the following are oxidation-reduction reactions except
(a) 2Al(s) + Fe2O3(s) ¨A12O3(s) + 2Fe(s)
(b) (NH4)2Cr2O7(s) ¨ Cr2O3(s) + N2(g) + H2O(1)
(c) Cu(s) + 2H2SO4(aq) ¨ CuSO4(aq) + SO2(g) + 2H2O(1)
(d) Hg(NO3)2 + 4KI ¨ K2HgI4(aq) +
(e) 2Na(s) + 2H2O(1) ¨ 2NaOH(aq) +
2) 13.00 mL of 0.52 M barium chloride is added to 8.00 mL of 0.68 M sodium sulfate in a beaker.
Identify the limiting reagent and its concentration?
BaCl2(aq) + Na2SO4(aq) ---> BaSO4 (s) + 2NaCl(aq)
(a) BaCl2 is the limiting reagent at a concentration of 6.76 x 10-3 mol
(b) BaCl2 is the limiting reagent at a concentration of 5.44 x 10-3 mol
(c) Na2SO4 is the limiting reagent at a concentration of 5.44 x 10-3 mol
(d) Na2SO4 is the limiting reagent at a concentration of 6.76 x 10-3 mol
(e) Neither as both have the same concentration
iii) Dilute acetic acid is added to solid nickel(II) carbonate.
i am not sure with the question , if u explain how to work out
Determine moles BaCl2 = M x L.
Determine moles Na2SO4 = M x L.
If moles are different e can't be right. Determine the lesser quantity, that will be the limiting reagent. I should point out here that none of the answers, technically, is correct. All of the answers cite moles while concn is moles/L. I supppose you are to go with the answer that is correct in moles.
iii. I don't know what the question is for this one but NiCO3 will dissolve in dilute acetic acid if it isn't too dilute.
it is to work to find the net ionic equation for question iii