Q 9 please 1) The coefficient of variation CV% of the data set shown below is19.4, 195, 196, 19.8, 20.1. 20.3b) 0.790a) 0.125c) 0.018 %2) The error that can be corrected by calibration:a) systematic errorb) gross errorc) randomd) rando error3) One of the following indicators can be used to determine the end point of the second first protonin H.PO.:a) Eriochrome Black Tb) Phenolphthaleinc) Methyl orange d) Chromate ion4) Ag+ ChAgCl. This is an example ofa) acid-base titration. b) precipitation titration. c) redox titration. d) complexation titration5) Ag+ (SCN)alacid-base titration. b) Volhard method.d) 0.354AgSCN) This is an example ofc) Fajan method. d) Moher method.6) The indicator that used in Fjan method isa) dichlorofluorescein b) murxide c) ferric ions (Fe) d) potassium chromate7) the indicator that used in moher method MOHR method isa) Eriochrome Black Tb) murxide c) ferric ions(Fe) d) potassium chromate8) VOHLARD method for determination of chloride ions in the solution is an example ofa) acid-base titration. b) back titration. c) redox titration. d) complexation titration9) The color of Eriochrome Black T changed (from to) in comlexometric titration of EDTA slatmixture of Ca² and Mg 2+a) green to yellowb) blue to pinkd) pink to colorlessc) wine red to bluc10) Which of these statements is not TRUE?a-Phenolephtalene indicator pink in basic mediab-Methyl orange used to identify the first endc-The primary standard for EDTA is ZnSO4 solutiond-EDTA considered as triprotic acid at pH=12point of H₂PO4.

Answered: Image /qna-images/answer/3ae8871d-0111-4a07-9237-22fa7c7a893c.jpg

Answered: 9) The color of Eriochrome Black T…

9) The color of Eriochrome Black T changed (from to) in comlexometric titration of EDTA slat mixture of Ca² and Mg 2+ a) green to yellow b) blue to pink c) wine red to blue. d) pink to colorless

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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