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18 Nov 2019
Experimental Procedure, Part A.1, Table 34.1. A 300-mL aliquot of 0.001 M NaSCN is diluted to 25.0 mL with 0.2 M Fe(NO_3)_3 and 0.1 M HNO_3. a. How many moles of SCN^- are present? b. If all of the SCN^- is complexed with Fe^3+ to form FeNCS^2+, what is the molar concentration of FeNCS^2+? Experimental Procedure, Part A.1. For preparing a set of standard solutions of FeNCS^2+, the equilibrium molar concentration of FeNCS^2+ is assumed to equal the initial molar concentration of the SCN^- in the reaction mixture. Why is this assumption valid? Experimental Procedure, Part A.3. The blank solution used to calibrate the spectrophotometer is 10.0 mL of 0.2 M Fe(NO_3)_3 diluted to 25.0 mL with 0.1 M HNO_3. Why is this solution preferred to simply using de-ionized water for the calibration? Plot the following data as absorbance versus [M^] as a calibration curve: A test solution showed a percent transmittance (% T) reading of 38.4% T. Interpret the calibration curve to determine the molar concentration of M^n+ in the test solution.
Experimental Procedure, Part A.1, Table 34.1. A 300-mL aliquot of 0.001 M NaSCN is diluted to 25.0 mL with 0.2 M Fe(NO_3)_3 and 0.1 M HNO_3. a. How many moles of SCN^- are present? b. If all of the SCN^- is complexed with Fe^3+ to form FeNCS^2+, what is the molar concentration of FeNCS^2+? Experimental Procedure, Part A.1. For preparing a set of standard solutions of FeNCS^2+, the equilibrium molar concentration of FeNCS^2+ is assumed to equal the initial molar concentration of the SCN^- in the reaction mixture. Why is this assumption valid? Experimental Procedure, Part A.3. The blank solution used to calibrate the spectrophotometer is 10.0 mL of 0.2 M Fe(NO_3)_3 diluted to 25.0 mL with 0.1 M HNO_3. Why is this solution preferred to simply using de-ionized water for the calibration? Plot the following data as absorbance versus [M^] as a calibration curve: A test solution showed a percent transmittance (% T) reading of 38.4% T. Interpret the calibration curve to determine the molar concentration of M^n+ in the test solution.
Nelly StrackeLv2
3 Jun 2019