Which data point(s) reflect pH = pka? 14 12 10 (iv) PH 6. (iii) (ii) 4. (i) 10 15 20 25 30 35 40 Volume (mL) () and (i) (ii) only O (i) and (iv) O (i) only 5,
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- how do i find x？Content C °- OWLv2 | O × Google Do G google slid x Inbox (4,5 x Certificate ☑ > Course E X Cengage L ✓ b Content C ✓ ChatGPT ✓ + prod03-cnow-owl.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator-assignment-take E4 CH 16 17 and 18 [References] Question 1 1 pt This question has multiple parts. Work all the parts to get the most points. Question 2 2 pts Question 3 1 pt Question 4 2 pts Trimethylamine, (CH3)3 N, is a common reagent. It interacts readily with diborane gas, B2H6. The latter dissociates to BH3, and this forms a complex with the amine, (CH3)3 N→BH3. The reaction between trimethylamine and borane is shown. Question 5 1 pt Question 6 × 2 pts Question 7 1 pt CH3 H CH3 H CH3-N: + -H CH3 N- B -H CH3 H CH3 H Question 8 2 pts Is the BH3 fragment a Lewis acid or a Lewis base? To decide this, answer the following questions: Question 9 1 pt a Which of the following is a definition of a Lewis acid? Question 10 2 pts Question 11 1 pt Question 12 1 pt O O O Question 13 1…(17,18-3,2) Select the most acidic hydrogen in the molecule below.
- Content C °- OWLv2 | O × Google Do G google slid x Inbox (4,5 x Certificate ☑ > Course E X Cengage L ✓ b Calculate ✓ ChatGPT × + prod03-cnow-owl.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator-assignment-take E4 CH 16 17 and 18 [References] Question 1 1 pt This question has multiple parts. Work all the parts to get the most points. Question 2 2 pts Question 3 1 pt Question 4 2 pts Trimethylamine, (CH3)3 N, is a common reagent. It interacts readily with diborane gas, B2H6. The latter dissociates to BH3, and this forms a complex with the amine, (CH3)3 N→BH3. The reaction between trimethylamine and borane is shown. Question 5 1 pt Question 6 × 2 pts Question 7 1 pt CH3 H CH3-N: + B CH3 H CH3 H CH3 -N- CH3 H Question 8 2 pts Is the BH3 fragment a Lewis acid or a Lewis base? To decide this, answer the following questions: Question 9 1 pt Question 10 2 pts a Which of the following is a definition of a Lewis acid? Question 11 1 pt Question 12 1 pt proton donor electron pair…For alanine, Ka1=5.1105,Ka2=1.81010 . Calculate the ratios [Z]/[C+] and [Z]/[A+] at pH (a) 2.00. (b) 6.00. (c) 10.50. What is the principal species at each pH?10- Identify the molecular ion in this spectrum and what type of compound is this?. Click on image to enlarge Rel. Abundance ☎ 100. 80.- 60.- 40. 20.- 0 10. 45 -15 (6.6%) b) 46 20. MASS SPECTRUM 31 (100%) c) 47 (%0E) 67 30. m/z 40 (%29) St 46 (21%) 47 (0.5%)
- (17,18-3,3) Select the most acidic hydrogen in the molecule below.(b=1.00 cm). The absorbance of the solution at 427 nm is 0.20. If the molar absorptivity of yellow dye at 427 nm is 27400 Mcm, what is the concentration of the solution in M? Type answer: ere to search 49°F Partly sunnyTScholarship Ap CovalentActivity.do?locator-assignment-take 31 = Report - Googl X D NGLSync Porta X X + Q [Review Topics] [References] Use the References to access important values if needed for this question. 8 more group attempts remaining 64°F Ka for phenol (a weak acid), C6H5OH, is 1.60x10-10. Ka for acetic acid, CH3COOH, is 1.80×10-5. Ka for hydrofluoric acid, HF, is 7.20×10-4. What is the formula for the strongest acid? Submit Answer Retry Entire Group 799+) OWLv2 | Online a A 40) 9:4 5/2
- d. dipôle moments between atoms. The mass spectrum of CH3F is given in the chart below. (a) Draw a likely structure for the molecular ion (m/z 34). (b) Assign structural formulas to the two other high abundance peaks (m/z 33 and m/z 15) in the spectrum. (c) Propose an explanation for the low abundance of the peak at m/z 19. Relative lon Abundance 100 80 60 40 20 _________g 10 15 MW: (g/mol) C=12 H₂= 3 F: 19 20 25 miz 30 35Explain why is FAAS a good method of quantifying Ca in milk?5. (1) (ii) Ibuprofen (206.3 g/mol) absorbs at 255 nm and shows a molar absorptivity of 3010 L/mol.cm. A tablet of ibuprofen, 0.6654 g, was ground and 0.2203 g powder was dissolved in 20% methanol in a 100 mL volumetric flask (Solution A). Exactly 5.0 mL of Solution A was diluted in a 50.0 mL flask and the resulting solution showed an absorbance of 0.1228 AU in a 1.00 cm cell. (i) What is the concentration (mol/L) of ibuprofen in the 100 mL stock solution? (ii) Report the amount of ibuprofen in mg/Tablet. Ibuprofen H3C | HCCH; 1 H3C CH3 -CH-COOH