1. Balance the following equation in basic conditions. Phases are optional. SO3(

Question

1. Balance the following equation in basic conditions. Phases are optional.

SO3(2-) + CO(OH)2 >>>> Co + SO4 (2-)

2. NiCl3 is a strong electrolyte. Determine the concentration of each of the individual ions in a 0.550 M NiCl3 solution. Answer:  Ni(3+) = _____M and Cl(-) = _______M

3. The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. A 5.23-g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCl(aq) and passed over a reducing agent so that all the antimony is in the form Sb3 (aq). The Sb3 (aq) is completely oxidized by 21.2 mL of a 0.140 M aqueous solution of KBrO3(aq). The unbalanced equation for the reaction is: BrO3(-)(aq)+Sb(3+)(aq)>>>>>Br(-)(aq) + Sb(5+)(aq) Unbalanced

Calculate the amount of antimony in the sample and its percentage in the ore. Answers will be:

_______g and ________%

4. The amount of I3

Explanation / Answer

1)

Co(OH)2 + SO3{2-} ? SO4{2-} + Co + H2O

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