5.) Buffer solutions contain salt (e.g. NaCI), real buffer and protease inhibitors. Imagine you prepare a solution with 25mM phosphate buffer (a weak acid). Which final pH do you expect if you mix 5mM dihydrogenphosphate (H2PO}") and 20mM monohydrogenphosphate (HPO;). (Note: Use the Henderson-Hasselbach equation for this purpose: pH = pKa + log (,PO | ( [HPO;"| How many mM of HCI do you have to add to adjust your buffer to a pH of 6.0? Which pH would this amount of HCl correspond to in the absence of 25mM phosphate buffer?

5.) Buffer solutions contain salt (e.g. NaCI), real buffer and protease inhibitors. Imagine you prepare a solution with 25mM phosphate buffer (a weak acid). Which final pH do you expect if you mix 5mM dihydrogenphosphate (H2PO}") and 20mM monohydrogenphosphate (HPO;). (Note: Use the Henderson-Hasselbach equation for this purpose: pH = pKa + log (,PO | ( [HPO;"| How many mM of HCI do you have to add to adjust your buffer to a pH of 6.0? Which pH would this amount of HCl correspond to in the absence of 25mM phosphate buffer?

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter20: Acidity And Pka Of Phenols

Section: Chapter Questions

Problem 3CTQ

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2) How many moles of methylammonium chloride (CH;NH;CI) are needed to prepare a buffer that is pH 9.64 and contains 0.15 moles methylamine (CH;NH2)? pK», CH;NH2 =3.36 *Show calculations!*
2) How many moles of methylammonium chloride (CH;NH;Cl) are needed to prepare a buffer that is pH 9.64 and contains 0.15 moles methylamine (CH;NH2)? pK», CH;NH2 = 3.36 *Show calculations!*
9:44 AM Fri Nov 27 令24% AA A sjc.cengagenow.com + E Football Latest Line... F5 Dynamic... Group Resea... Mastery 10-15 OWLV2 | Onli... C Search Text... C dept.cld G SIERRA SIERRA Module 10-12 [Review Topics] [References] 1. Buffer Solutions: Identify Buffer 2 pts M Use the References to access important values if needed for this question. A buffer solution is made that is 0.341 M in H2S and 0.341 M in 2. Buffer Solutions: Write Equation ... 2 pts 2req Question KHS. Question If Question Kal for H2S is 1.00 x 10-, what is the pH of the buffer solution? 3. Buffer Solutions: Buffer Capacity... 2 pts 2req pH Write the net ionic equation for the reaction that occurs when 0.095 mol HBr is added to 1.00 L of the buffer solution. (Use the lowest ble coefficients. Omit states of matter. Use H3 O* instead of Ht) + Submit Answer Retry Entire Group 8 more group attempts remaining Progress: 1/3 groups Due Nov 28 at 11:55 PM Previous Next Finish Assignment Save and Exit
Item 10 MISSED THIS? Watch KCV 122. IWE 17.2. IWE 17.3: Read Section 17.2. You can click on the Review link to access the section in your eText Blood is buffered by carbonic acid and the i bicarbonate ion. Normal blood plasma is 0.024 M in HCO, and 0.0012 M in H₂CO,. (pK₁ for H₂CO, at body temperature is 6.1.) Part min Given the volume from Part B, what mass of NaOH could be neutralized before the pH rose above 8.2? Express your answer to two significant figures. Submit 196] ΑΣΦΑ Previous Answers Request Answer 10 of 26 Beview I Constants I Periodic Table 6
presented by Macmillan Learning Phosphoric acid is a triprotic acid (Kal = 6.9 x 10-3, K = 6.2 x 10-8, and K3 = 4.8 x 10-13). To find the pH of a buffer composed of H, PO, (aq) and HPO? (aq), which pK, value should be used in the Henderson-Hasselbalch equation? O pKal = 2.16 %3D O PK22 =7.21 O pK33 = 12.32 Calculate the pH of a buffer solution obtained by dissolving 10.0 g of KH, PO, (s) and 25.0 g of Na, HPO,(s) in water and then diluting to 1.00 L. = Hd Question Source: McQuarrie, Rock, And Gallogly 4e - General Chemsitry Publisher: University Scier 7:13 PM 11/8/202 五 0 FZ F8 F10 F11 F12 PrtScr Insert Delete F4 F5 Backspace 23 7. 8. 3. 5. R. E D F H B. N W PgUp Alt Ctrl Home PgDn
Please help with #10-12. I'm not sure how to calculate the new theoretical pH when increasing buffer pH with NaOH. Thank you 1. pH of the buffer needed to prepare:... 10. 0 (1).... Na z CO, NaH COs 2. Reagents selected to make a buffer: (2).... 3. Reasons for selecting the reagents:I chose these reagents because our assigned pH is 10, and the pKa of Sodium Carbonate is close to 10, along with the matching acid Sodium Bicarbonate 4. Calculated amount of reagents needed to prepare a buffer: reagent 2 Total Buffer volume: 100mL reagent 1 [Buffer]: 0.05 M 0.1689 g or ml 0.2862 g or ml 1.593x10°| moles 3.407x10| moles 5. pH of a buffer measured with pH-meter. 10.07 6. Calculated ionic strength.. 0.08187 7. Calculated activity coefficient. Bicarbonate (H"): 0.7896| Carbonate: 0.3887 8. Calculated theoretical pH of "real" buffer... 10.10 9. Difference between measured and calculated pH of buffer.. 0.03261 10. Reagent used to adjust the pH (mark one) (Born are 1-0oM) NaOH HCI Volume: _0 · O6…
17) Determine the pH of a carbonate buffer system that contains 0.0065 M of HCO3- and 0.0084 M of CO32-. The Ka of HCO3- is 4.7x10-11.
). You are running an experiment and need to keep your solution within a certain pH range: 3.5 +/- 1pH unit. Choose a buffer system (e.g. a conjugate acid/base) with a pKa in the appropriate range.. Assuming you have 0.2M stock solutions of the acid and conjugate base, calculate the L of each need to make 400 mL of buffer. Describe clearly your protocol for making the buffer solution to the desired pH. Calculate pH for the following. Add 100 mL of 0.100 M HCl to pure water Add 100 mL of 0.100 M HCl to the 400 mL of buffer you made Add 100 mL of 0.100 M NaOH to pure water Add 100 mL of 0.100 M NaOH to the 400 mL of buffer you made Please complete the problem
You need to prepare 100.0 mL of a pli 4.00 buffer solution using (0.100 M henzoic acid (pk, = 4.20) and 0.160 M sodium benzoate. %3D How many milliliters of eaclh solution should be mixed to prepare this buffer? henzoic acid: sodium benzOute: mL ml.
9:45 AM Fri Nov 27 令24% AA sjc.cengagenow.com F5 D Group Resea... Mastery 10-15 OWLV2 | Onli... Search Text.. C dept.clcillino... G green and w... y! Yahoo Mai SIERRA SIERRA Module 10-12 [Review Topics] [References] 1. Buffer Solutions: Identify Buffer 2 pts M) Use the References to access important values if needed for this question. A buffer solution is made that is 0.360 M in HNO2 and 0.360 M in KNO2. 2. Buffer Solutions: Write Equation ... 2 pts 2req Question Question Visited If Question Ka for HNO2 is 3. Buffer Solutions: Buffer Capacity... 2 pts 2req 4.50 x 10-4, what is the pH of the buffer solution? pH Write the net ionic equation for the reaction that occurs when 0.095 mol KOH is added to 1.00 L of the buffer solution. (Use the lowest possible coefficients. Omit states of matter.) + + Submit Answer Retry Entire Group 8 more group attempts remaining Progress: 1/3 groups Due Nov 28 at 11:55 PM Previous Next Finish Assignment Save and Exit
(a) H* Catalyst Zn(Hg)/HCI (b) H Ph,P CO,Me (c) H 1. Mg d) 2. H30* Br NH2 Ph (e) H* Catalyst MCPBA (f)
40.00 mL of 0.0900 M NaOH is diluted to 100mL and titrated with 0.1000M HCI. Calculate the pH after the addition of the following volumes of titrant (mL); (g) 36.05 ; (h) 40.00.