Wich of the following is NOT true about the blank for the experiment, 'Analysis of a Complex Iron Salt'?
A. A blank is titrated to correct for any reactive impurities in the solvent. For this experiment, the impurities would be reducing agents that would react with KMnO4 (mimicking the behavior of C2O42– ).
B. A blank is composed of the solvent used to dissolve the analyte. For this experiment, the solvent is a combination of sulfuric acid, phosphoric acid, and water.
C. The volume required to titrate the blank is subtracted from the volume used to titrate the analyte solution to give the "corrected volume".
D. The blank for this experiment must have 100 % transmittance if placed in a spectrometer (Spec 20).
E. All of these are true.
aparently it is the 100% transmittance one....
To determine which statement is NOT true about the blank for the experiment 'Analysis of a Complex Iron Salt', we need to evaluate each option and identify any inconsistencies.
A. A blank is titrated to correct for any reactive impurities in the solvent. For this experiment, the impurities would be reducing agents that would react with KMnO4 (mimicking the behavior of C2O42– ): This statement is true. A blank is often used to correct for impurities present in the solvent that may interfere with the analysis.
B. A blank is composed of the solvent used to dissolve the analyte. For this experiment, the solvent is a combination of sulfuric acid, phosphoric acid, and water: This statement is true. The blank is typically made up of the same components as the solvent used to dissolve the analyte.
C. The volume required to titrate the blank is subtracted from the volume used to titrate the analyte solution to give the "corrected volume": This statement is true. The volume of the blank is subtracted from the volume used to titrate the analyte to account for any titration that occurred with impurities in the solvent.
D. The blank for this experiment must have 100% transmittance if placed in a spectrometer (Spec 20): This statement is NOT true. In spectrophotometry, an experiment that involves measuring the transmittance or absorbance of a sample, a blank is typically used to provide a baseline value with zero absorbance or maximum transmittance. The blank is not expected to have 100% transmittance.
Therefore, the correct answer is:
D. The blank for this experiment must have 100% transmittance if placed in a spectrometer (Spec 20).