In one experiment, an 80.0-mL sample of hydrocyanic cid (HCN) was titrated with 20.0 mL of triiodide (I3-) in the reaction: HCN (aq) +  I3- (aq) --> ICN (aq) + 2 I- (aq) + H+ (aq)   40.0 mL of the same triiodide solution were required to titrate 0.200 mol of H3AsO3 (aq) in the reaction: H3AsO3 (aq) +  I3- (aq) + H2O (l) --> H3AsO4 (aq) + 3  I- (aq) + 2H+ (aq)   What is the molar concentration of HCN (aq)?  (Answer in sig figs)

Chemistry by OpenStax (2015-05-04)
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ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
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Chapter4: Stoichiometry Of Chemical Reactions
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In one experiment, an 80.0-mL sample of hydrocyanic cid (HCN) was titrated with 20.0 mL of triiodide (I3-) in the reaction:

HCN (aq) +  I3- (aq) --> ICN (aq) + 2 I- (aq) + H+ (aq)

 

40.0 mL of the same triiodide solution were required to titrate 0.200 mol of H3AsO3 (aq) in the reaction:

H3AsO3 (aq) +  I3- (aq) + H2O (l) --> H3AsO4 (aq) + 3  I- (aq) + 2H+ (aq)

 

What is the molar concentration of HCN (aq)?  (Answer in sig figs) 

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