Which of the following correlations in the qualitative analysis experiment is incorrect? a. CO32- : evolution of H2 gas b. SCN- : formation of FeSCN2+ complex c. Zn2+ : precipitate is soluble in NaOH and NH3 d. NH4+ : red litmus paper turned blue
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Which of the following correlations in the qualitative analysis experiment is incorrect?
b. SCN- : formation of FeSCN2+ complex
c. Zn2+ : precipitate is soluble in NaOH and NH3
d. NH4+ : red litmus paper turned blue
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Solved in 6 steps
- A. Separation of Ni²+ and Fe³+ from Zn²+ and Al³+ B. Test for Iron(III) Ion 17b 13b 11 11f C. Test for Nickel Ion E. Test for 17b Zinc Ion 13b D. Test for Aluminum Ion 17b The Next Step 11f To digest the precipitate: to make the precipitate more compact 11f The Experimental Procedure is written for a single reference solution. If you are simul- taneously identifying cations in both a reference solution and a test solution, adjust the procedure accordingly. If the test solution is a sample with an environmental origin, then gravity filter 10-15 mL before beginning the Experimental Procedure. Prepare the hot water bath for use in Parts A and D. 1. Separate the hydroxide precipitates from the amphoteric hydroxides. To 2 mL of the reference solution (in a small test tube) add 10 drops of 6 M NaOH (Caution!) (see Dry Lab 4.A). Centrifuge and save the precipitate. Test for complete precipita- tion (see Dry Lab 4.B) by adding several drops of 6 M NaOH to the supernatant. Decant the…14. A 130.00 mL solution of 0.00335 M A3B4 is added to a 160.00 mL solution of 0.00105 M C3D4. What is pQsp for A3D4?Arrange the the colors for each transitions of the following analyses: (Note: If you feel an item should be blank, you need to drag the blank box into it, otherwise it will be considered a wrong answer) 1. Winkler Analysis 2. Double-Indicator Titration (you may repeat answers here 3. EDTA Titration 4. lodine Clock Clear Light Yellow Dark Yellow Dark Blue Red Clear Yellow-Orange Yellow Pink Orange Faint Blue Wine Red Purple/Violet Bright Blue Dark Yellow | Light Yellow Dark Blue Clear
- Which salt would increase in solubility if a strong acid is added to the solution? OA TIBR OB. KCIOA OCPbl2 O D. two of these answers E. SrF2 OF BaCrOA QUESTION 20 What major species are present at the equivalence point when 3-butenoic acid( C2H5COOH) is titrated with KOH? Note: Incorrect answers will negatively offect score. A. C3H5COOH B.OH H30 Dox11. Which is a highly purified compound that serves as a reference material in titration? A. secondary standard B. indicator solution C. primary standard D. reference solution11. A 0.485 g sample containing chloride was titrated with 36.8 mL of 0.1060 M AgNO3 stock solution. Express the results of this analysis in:a) Percent by weight of Clb) Weight percent Cl2c) Percent by weight of CaCl2d) Weight percent of AlC13
- Which of the following can be used to determine the turning point in a complexometric titration? A. Redox markers B.Adsorption markers C. Eriochrome black T D. Fenolftaleynexist? 4. What makes bromocresol green and phenolphthalein suitable for the double- indicator process? 5. Write the stepwise equilibria for the neutralization of Na2CO3 with HCI. 6. What is the acid/base ratio? Why is it important in titrimetric process?1. The end point for Volhard method is the formation of a red solution due to iron thiocyanate complex. True False 2. Fajan Method uses an indicator, dichlorofluoroscein, to detect the end point. Change in color of the indicator from yellow to red is possible because the indicator is adsorbed by silver chloride precipitate beyond the equivalence point. True False
- A 75.0-mL sample of 0.00300 M AGNO3 is added to 50.0 mL of 0.0700 M NalO3. Determine the: a.Initial concentrations of Ag- and 10-. b.lon product (Qsp). Will AglO3 (Ksp = 3.17 x 10-8) precipitate? c.Equilibrium concentrations of Ag+ and 103-.Which of the following is an application of gravimetric analysis ? a. determination of % AgCl by precipitating KCl comple b. determination of % AgCl by precipitating Ag(NH3)2 complex c. determination of % NaNO3 in sample by precipitating NaCl d. determination of % NaCl in sample by precipitating AgCl5. A 300.0 mg sample containing Na,CO3, NaHCO3 and NaOH and inert material either alone or in some combination was dissolved and titrated with 0.1000 M HCI the titration required 24.41 mL to reach the phenolphthalein endpoint. And an additional 8.67 mL to reach the methyl red endpoint. Determine the composition of the sample and calculate the percent of each titrated component.