14. The mixtures of the two chemical compounds listed below which when combined could be buffers. Which of the following mixtures would be a buffer? H2CO3 and H3PO4 are weak acids and HNO3 and HCl are strong acids. You can have more than one answer so list all of the mixtures that could be buffers. List the potential buffers by letter. a. H2CO3 + LizCO3 b. H3PO4 + NaCI c. HNO3 + NANO3 d. H3PO4 + RBH2PO4 e. H3PO4 + LICO3

14. The mixtures of the two chemical compounds listed below which when combined could be buffers. Which of the following mixtures would be a buffer? H2CO3 and H3PO4 are weak acids and HNO3 and HCl are strong acids. You can have more than one answer so list all of the mixtures that could be buffers. List the potential buffers by letter. a. H2CO3 + LizCO3 b. H3PO4 + NaCI c. HNO3 + NANO3 d. H3PO4 + RBH2PO4 e. H3PO4 + LICO3

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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26. The IR, 1H NMR, and 13C NMR spectra of an unknown compound, 140GH (C₂H100) are shown below. Identify the unknown compound. Note: Use a ruler to calculate the integration. C NMR spectrum: 3 small peaks at 78 ppm are due to CDCl (solvent) Transmittance 12 4000 Ss 7.0 W MY 150 6.5 6.0 3000 Wavenumbers (cm) 2120 2100 2080 S 5.5 2000 5.0 140 130 120 110 100 90 80 70 ли 2060 H₂ 4.0 60 1000 50 40 3.0 30 20 ppm ppm
What is the starting material?
10. Me & l Me Me cat. H₂SO4 benzene Me Me &
CI Pd(OAc)2 (cat.) (t-Bu)2P (cat.) NaOf-Bu toluene, RT
Ag+(aq)+e-→Ag(s) 0.800 Al3+(aq)+3e-→Al(s) -1.676 Au+(aq)+e-→Au(s) 1.692 Au3+(aq)+3e-→Au(s) 1.498 Ba2+(aq)+2e-→Ba(s) -2.912 Be2+(aq)+2e-→Be(s) -1.847 Br2(l)+2e-→2Br-(aq) 1.066 Ca2+(aq)+2e-→Ca(s) -2.868 Cd2+(aq)+2e-→Cd(s) -0.403 Ce4+(aq)+e-→Ce3+(aq) 1.72 Cl2(g)+2e-→2Cl-(aq) 1.358 Co2+(aq)+2e-→Co(s) -0.28 Co3+(aq)+e-→Co2+(aq) 1.92 Cr2+(aq)+2e-→Cr(s) -0.913 Cr3+(aq)+e-→Cr2+(aq) -0.407 Cr3+(aq)+3e-→Cr(s) -0.744 CrO42-(aq)+4H2O(l)+3e-→Cr(OH)3(s)+5OH-(aq) -0.13 Cr2O72-(aq)+14H+(aq)+6e-→2Cr3+(aq)+7H2O(l) 1.36 Cu+(aq)+e-→Cu(s) 0.521 Cu2+(aq)+e-→Cu+(aq) 0.153 Cu2+(aq)+2e-→Cu(s) 0.342 F2(g)+2e-→2F-(aq) 2.866 Fe2+(aq)+2e-→Fe(s) -0.447 Fe3+(aq)+e-→Fe2+(aq) 0.771 Fe3+(aq)+3e-→Fe(s) -0.037 2H+(aq)+2e-→H2(g) 0.000 2H2O(l)+2e-→H2(g)+2OH-(aq) -0.828 H2O2(aq)+2H+(aq)+2e-→2H2O(l) 1.776 Hg2+(aq)+2e-→Hg(l) 0.851 2Hg2+(aq)+2e-→Hg22+(aq) 0.92 Hg22+(aq)+2e-→2Hg(l) 0.797 I2(s)+2e-→2I-(aq) 0.536…
b. C. ΝΗ 19 starting material final product starting material d. N-CH3 ὋΗ final product OH -CH3 $1 starting material final product
21
3. OCH3 1. LiAlH4 2. H₂O* 3. SOCI₂ OCH3 H
1. LDA, -78°C 2 CHIẾ 1. NaH 2. 1. LDA, -78°C 2. CH_Br 3. LDA, -78°C 4. CH_Br Br 1. NaH 2. Br
Blank 1(there is only one correct answer): 3 4 5 6 Blank 2(there is only one correct answer): A B C D
10. Classify the following alcohols as primary, secondary, or tertiary a. b. LOH d. OH OH OH
e: H 29 add arrows here HCL, H₂0 add arows here e:p: H 30: H HO -H 0:0 ℗ H H :0: 1 H HCL, H₂O HCL, H₂0 :d:e HAH H H add anows here 12: I H •HO G H 60: f