Eff- Practice Problem 7 10/9/2024 Practice Problem 8 Part B A drug solution needs pH of 8.8 for optimum stability. A boric acid-H sodium borate buffer system is selected for this purpose. How much M) solid sodium borate (in moles) will have to be added to a 50mL of 0.01M boric acid solution? (pKa of boric acid = 9.24) Part III 8 Eff- Practice Problem 7 10/9/2024 Practice Problem 8 Part B A drug solution needs pH of 8.8 for optimum stability. A boric acid-H sodium borate buffer system is selected for this purpose. How much M) solid sodium borate (in moles) will have to be added to a 50mL of 0.01M boric acid solution? (pKa of boric acid = 9.24) Part III 8

Eff- Practice Problem 7 10/9/2024 Practice Problem 8 Part B A drug solution needs pH of 8.8 for optimum stability. A boric acid-H sodium borate buffer system is selected for this purpose. How much M) solid sodium borate (in moles) will have to be added to a 50mL of 0.01M boric acid solution? (pKa of boric acid = 9.24) Part III 8 Eff- Practice Problem 7 10/9/2024 Practice Problem 8 Part B A drug solution needs pH of 8.8 for optimum stability. A boric acid-H sodium borate buffer system is selected for this purpose. How much M) solid sodium borate (in moles) will have to be added to a 50mL of 0.01M boric acid solution? (pKa of boric acid = 9.24) Part III 8

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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A 0.1 g amine-containing compound is dissolved in water then diluted to 100 mL. To get the concentration of amine in this compound, you subject it to spectroscopic analysis. So, you get 1 mL of the previously diluted sample then dilute it again to 250 mL for measurement. Then, you fill 3/4 of a 1-cm cuvette with this diluted sample then you run an analysis using an AAS. The recorded absorbance is 0.545 at 410 nm. Solve for the molecular weight of the compound. The molar absorptivity is 1.23 x 104 cm-1 mol-1 L.
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17 Question (3 points) The common pain relievers - aspirin (C₂H8O4), acetaminophen (CgH,NO₂), and naproxen sodium (C14H1303Na) - are available in tablets containing 125 mg of the active ingredient. Express your answers to three significant figures. 1st attempt Part 1 125 mg aspirin = Part 2 125 mg acetaminophen = Part 3 125 mg naproxen sodium = 16 OF 17 QUESTIONS COMPLETED C9H8O4 molecules CgH9NO₂ molecules C14H1303Na molecules < 17/17 DELL 4 e See page ni See Periodic Table See Hint SUBMIT ANSWER
For questions #14-16, you should do your work on a separate piece of paper and then upload it. You should use the GUESS Method of solving for each problem. Also, you have a choice. You can complete both #14 & #15 which are single step question or do the extension problem which is a 2 step problem instead of 14 & 15. You must complete #16. Equations Q = mcAT Q = ±mLf Q = ±mLv Values for Water Clice) = 2.06 J/g°C C(water) = 4.186 J/g°C C(steam) = 1.87 J/g°C Lf (water) = 333 J/g Lv (water) = 2,260 J/g %3D G- S- U- E- S- #14. Calculate the energy required to heat 12.5 g of water from a temperature of 42.2°C to 52.3°C. #15. How much thermal energy is needed in order to turn 15.7 grams of water into ice? Extension: We start with 23.2 grams of ice at 0°C and add heat to the ice. The ice completely melts and then is heated until it reaches 45.3°C. How much energy is added in total? #16. 12.0 g of a metal absorbs 317 J when it is heated from 38.2°C to 82.7°C. What is the specific heat of the…
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Data Analysis: 1. Create an Absorbance (Y) vs. Concentration (X) graph using data from the six standard solutions above. 2. Perform a linear trendline analysis of your six data points. Display the equation and R² value on the graph with a minimum of 8 decimal places. 3. On the same graph, perform a 2nd order polynomial trendline analysis of your six data points. Display the equation and R² value on the graph with a minimum of 8 decimal places. 4. Turn in your graph as the last page of this report. 5. On a separate piece of paper calculate the concentration of the unknown solution using both the linear and 2nd order polynomial trendline equations (Show all work) 6. Choose the best unknown concentration from #4 above and report it with three significant figures in the unknown data table above.
Bromophenol blue= max 600 concentration (M) of the original solution =10.0 mg/L absorbance solution 1 = 0.20 solution 2 = 0.43 %3D %3D solution 3 = 0.66 solution 4 = 0.93 %3D solution 5 = 1.10 I need the concentration (M) in all the solution
Consider the following reaction. O + 0 CHBr3 Draw the major organic product formed in this reaction. 81 + [**** (CH3)3CO¹K+ • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • Include H atoms at chiral centers only. • Show stereochemistry in a meso compound. If the reaction produces a racemic mixture, just draw one stereoisomer. - √n [F] ?
Assessment 2 subparts 3-4
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