Problems B
307
(a) C 3 H 8 O + MnO 4 ~ -> CO 2 (acidic)
(b) CN- + MnO 4 - -> CNCT + MnO 2 (basic)
(c) CH 2 O + Ag(NH 3 ) 2
+ -> Ag + HCO 2 - (basic)
(d) CHC1 3 + MnOj -> C1 2 + CO 2 (acidic)
(e) MnO 4 - + C 2 H 3 OC1 -> CO 2 + C1 2 (acidic)
(f) C 2 H 6 O + Cr 2 or -» HC 2 H 3 O 2 (acidic)
15. Write balanced equations for the reactions that occur in each of the following
situations.
(a) Chlorine gas is bubbled through a solution of ferrous bromide.
(b) In the final step of producing bromine from sea water, a mixture of sodium
bromide and sodium bromate is treated with sulfuric acid.
(c) A microchemical procedure uses a cadmium amalgam (cadmium dissolved in metallic mercury) to reduce iron salts to their lowest valence
state prior to titration with standard eerie sulfate. Give the equation for
the reaction involving the cadmium.
(d) When zinc is heated with concentrated sulfuric acid, hydrogen sulfide is
evolved.
(e) Pure hydrobromic acid cannot be prepared by treating sodium bromide
with concentrated sulfuric acid and distilling off the hydrobromic acid,
because some sulfur dioxide is produced at the same time, as noted by the
odor. Give the equation for the production of sulfur dioxide.
(f) Sodium perchlorate is prepared by carefully heating solid sodium chlorate.
(g) The Marsh test for the detection of arsenic depends on the reaction of an
arsenic compound, such as H 3 AsO 4 , with metallic zinc in acid solution to
give arsine, AsH 3 .
16. Balance the equations given in Problem 9, page 425.
307
(a) C 3 H 8 O + MnO 4 ~ -> CO 2 (acidic)
(b) CN- + MnO 4 - -> CNCT + MnO 2 (basic)
(c) CH 2 O + Ag(NH 3 ) 2
+ -> Ag + HCO 2 - (basic)
(d) CHC1 3 + MnOj -> C1 2 + CO 2 (acidic)
(e) MnO 4 - + C 2 H 3 OC1 -> CO 2 + C1 2 (acidic)
(f) C 2 H 6 O + Cr 2 or -» HC 2 H 3 O 2 (acidic)
15. Write balanced equations for the reactions that occur in each of the following
situations.
(a) Chlorine gas is bubbled through a solution of ferrous bromide.
(b) In the final step of producing bromine from sea water, a mixture of sodium
bromide and sodium bromate is treated with sulfuric acid.
(c) A microchemical procedure uses a cadmium amalgam (cadmium dissolved in metallic mercury) to reduce iron salts to their lowest valence
state prior to titration with standard eerie sulfate. Give the equation for
the reaction involving the cadmium.
(d) When zinc is heated with concentrated sulfuric acid, hydrogen sulfide is
evolved.
(e) Pure hydrobromic acid cannot be prepared by treating sodium bromide
with concentrated sulfuric acid and distilling off the hydrobromic acid,
because some sulfur dioxide is produced at the same time, as noted by the
odor. Give the equation for the production of sulfur dioxide.
(f) Sodium perchlorate is prepared by carefully heating solid sodium chlorate.
(g) The Marsh test for the detection of arsenic depends on the reaction of an
arsenic compound, such as H 3 AsO 4 , with metallic zinc in acid solution to
give arsine, AsH 3 .
16. Balance the equations given in Problem 9, page 425.