30. for BaCl2 solution in aqueous Na2SO4 appear white precipitate31. for the solution of NaOH in solution of Al2 (SO4) 3 the subject is appearing white glue then precipitate precipitate dissolves gradually 32. for inventory and capacity of NaOh into aqueous Fe (NO3) 2 appears blue-white precipitate, so long in the air turned red-brown33. for the solution of NaOh in aqueous Cu (NO3) 2 appear to precipitate in blue34. as for the residual solution in Na2CO3 AlCl3 appear white foam, glue precipitated fly out35. for Fe in a solution of CuSO4 solution, then faded Green has treated red cling onto the iron nail36. tub CO2 from from to balance on aqueous Ca (OH) 2 have precipitated bullshit opaque then tan37. for the residual aqueous NaHCO3 came slowly to Three (OH) 2 is the white precipitate forms38. ion CO32-does not react with the ion is NH4 +, Na +, K + 39. The OH-ion can react with H + ions, NH4 +, HCO3-40. aqueous Na2CO3 can work with all the substances CO2, Ca (OH) 2, BaCl2, H2SO4, HClO41. the sequence of the substance reacts with aqueous NaOH is Cl2, NaHCO3, C6H5NH3Cl42. the sequence consisting of the substance just dissolves in aqueous HCl and NaOH is NaHCO3, Ca (HCO3) 2 and Al2O3
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