4 Assume that an aqueous solution of a cation, represented as a red sphere, is allowed to mix with a solution of an anion, represented as a yellow sphere. Three possible outcomes are represented by boxes (1)–(3):4.24Which outcome corresponds to each of the following reactions?(a) 2 Na+(aq) + CO32(aq)(b) Ba2+(aq) + CrO42-(aq)(c) 2 Ag+(aq) + SO32(aq)
5 Assume that an aqueous solution of a cation, represented as a blue sphere, is allowed to mix with a solution of an anion, represented as a green sphere, and that the following result is obtained:4.25Which combinations of cation and anion, chosen from the following lists, are compatible with the observed results? Explain.Cations: Na+, Ca2+, Ag+, Ni2+Anions: Cl, Ca32, CrO42, NO3
6 4.26Assume that an aqueous solution of OH, represented as a blue sphere, is allowed to mix with a solution of an acid HnA, represented as a red sphere. Three possible outcomes are depicted by boxes (1)–(3), where the green spheres represent On, the anion of the acid:Which outcome corresponds to each of the following reactions?(a) HF + OH H2O + F(b) H2SO3 + 2 OH H2O + SO32(c) H3PO3 + 2 OH H2O + PO43
7 4.27The concentration of an aqueous solution of NaOCl (sodium hypochlorite; the active ingredient in household bleach) can be determined by a redox titration with iodide ion in acidic solution:Ocl(aq) + 2 I(aq) + 2 H+(aq) Cl–(aq) + I2(aq) + H2O(l)Assume that the blue spheres in the buret represent I ions, the red spheres in the flask represent Ocl ions, the concentration of the I ions in the buret is M, and the volumes in the buret and the flask are identical. What is the concentration of NaOCl in the flask? What percentage of the I solution in the buret must be added to the flask to react with all the OCl ions?
8 Assume that the conductivity of a solution depends on the total concentration of dissolved ions and that you measure the conductivity of three different solutions while carrying out titration procedures:(a) Begin with 1.00 L of M KCl, and titrate by addition of M AgNO3.(b) Begin with 1.00 L of M HF, and titrate by addition of M KOH.(c) Begin with 1.00 L of M BaCl2 and titrate by addition of M Na2SO4.Which of the following graphs corresponds to which titration?4.28
9 Based on the positions in the periodic table, which of the following reactions would you expect to occur?(a) Red+ + Green Red + Green+(b) Blue + Green Blue+ + Green(c) Red + Blue Red+ + Blue4.29