Which of the following is NOT true about the blank for the experiment, 'Analysis of a Complex Iron Salt'?
A. 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.
B. 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– ).
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.
It would help if we knew the experiment you were dong and how you were doing it. I suspect the answer is D. Blanks need not be 100% in almost any analysis with the Spec 20.
yes it is D. I tried it and it was correct.
To determine which of the statements is NOT true about the blank for the experiment 'Analysis of a Complex Iron Salt', we need to evaluate each statement individually.
A. 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 generally true. A blank is typically made up of the same solvent used to dissolve the analyte, allowing us to account for any effects the solvent may have on the measurement.
B. 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 also generally true. The purpose of a blank is to account for impurities or contaminants in the solvent that may interfere with the analysis. Titration with a known concentration of a reagent can help correct for these impurities.
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 required to titrate the blank is subtracted from the volume used to titrate the analyte solution to correct for any variation or discrepancy caused by the blank. This calculation allows for a more accurate determination of the analyte concentration.
D. The blank for this experiment must have 100% transmittance if placed in a spectrometer (Spec 20).
This statement is NOT true. Transmittance refers to the amount of light that passes through a sample, and it is not a requirement for the blank to have 100% transmittance. In fact, the blank is used as a reference point to account for any background absorbance or scattering effects, so it may not have complete transmittance.
E. All of these are true.
Since statement D is not true, the correct answer is E. All of the statements are not true about the blank for the experiment 'Analysis of a Complex Iron Salt'.