If there were a fingerprint on a cuvette, how would the error affect the calculated FeNCS2+ (product)ion concentration in the solution?

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If there were a fingerprint on a cuvette, how would the error affect the calculated FeNCS2+ (product)ion concentration in the solution? Why can you make the assumption that all of the SCN- (reactant)ion in the solutions has been converted to FeNCS2+ ion?

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