While performing the nitrogen test, you forgot to add sulfuric acid to the sample solution. Why is acidifying the solution important? To help oxidize ferrous ions to ferric ions. To form the green ferrous hydroxide precipitate. To dissolve the green ferrous hydroxide precipitate. To intensify the prussian blue color. To help reduce ferric ions to ferrous ions.

While performing the nitrogen test, you forgot to add sulfuric acid to the sample solution. Why is acidifying the solution important? To help oxidize ferrous ions to ferric ions. To form the green ferrous hydroxide precipitate. To dissolve the green ferrous hydroxide precipitate. To intensify the prussian blue color. To help reduce ferric ions to ferrous ions.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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3. 11 100 TRANSMETTANCE D C8H9CIO 4000 10 HSP-01-151 9 3000 8 2:2 7 2000 6 : 5 ppm 2 NAVENUMBERal 4 3 1500 : Vala 2 1000 3 1 0 500 200 180 COS-04-715 DEPT-90 DEPT-135 160 140 120 بلد لد 100 ppm 80 60 40 20 0
A solution of DNA of unknown concentration (termed "[unknown] DNA solution") gave an absorbance value of 0.39 at 260 nm. The goal here is to determine the DNA concentration of this [unknown] DNA solution. To calculate this, you are given the following additional information: A DNA solution whose concentration is 50 ug/ml has an absorbance value of 1.0 at 260 nm. Using this information and knowing that A1/C1 = A2/C2 i. Calculate the DNA concentration (ug/mL) in the DNA solution of [unknown] ii. iii. iv. Once you have determined the DNA concentration of [unknown] DNA solution, calculate how many ug of DNA would be present in 25 μl of this DNA solution If you dilute the "[unknown] DNA solution" 10-fold, i.e. 1/10, what will the absorbance value (at 260 nm) of the diluted solution be? What will the new concentration of DNA of the diluted solution be?