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Which buffer system is the best choice to create a buffer with pH = 7.30 ? HCIO2/KCIO2 HC2H3O2/KC2H3O2 NH3/NHẠC1 HCIO/KCIO Previous Answers Correct The effective range for a buffering system is one pH unit on either side of pKa . Therefore, calculate the pKa for each buffer system. For HC2H302/KC2H302 pKa - log Ka - log(1.8 x 10-5 4.74 For HCIO2/KCIO2 ,pKa = 1.96 ; for HCIO/KCIO , pKa = 7.54 ; and, for NH3/NHẠC1 pka = 14.00 – pKb = 14.00 – 4.754 9.25 So, HCIO/КCIO is the best choice to create a buffer with pH = 7.30 because HCIO has the pKa value that is closest to 7.30. Part B For the best system, calculate the ratio of the masses of the buffer components required to make the buffer. Express your answer to two significant figures.

Which buffer system is the best choice to create a buffer with pH = 7.30 ? HCIO2/KCIO2 HC2H3O2/KC2H3O2 NH3/NHẠC1 HCIO/KCIO Previous Answers Correct The effective range for a buffering system is one pH unit on either side of pKa . Therefore, calculate the pKa for each buffer system. For HC2H302/KC2H302 pKa - log Ka - log(1.8 x 10-5 4.74 For HCIO2/KCIO2 ,pKa = 1.96 ; for HCIO/KCIO , pKa = 7.54 ; and, for NH3/NHẠC1 pka = 14.00 – pKb = 14.00 – 4.754 9.25 So, HCIO/КCIO is the best choice to create a buffer with pH = 7.30 because HCIO has the pKa value that is closest to 7.30. Part B For the best system, calculate the ratio of the masses of the buffer components required to make the buffer. Express your answer to two significant figures.

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter14: Equilibria In Acid-base Solutions
Section: Chapter Questions
Problem 31QAP: Enough water is added to the buffer in Question 29 to make the total volume 10.0 L. Calculate (a)...
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MISSED THIS? Read Section 18.3 (Pages 799 - 802) . The following table shows the values of ionization constants for a number of acids and bases at 25 °C : Which buffer system is the best choice to create a buffer with pH = 7.30 ? Formula Ка Kb HC1O2/KC1O2 HC2H302 1.8 × 10–5 HC102 HC2H302/KC2H3O2 1.1 x 10–2 NH3 1.76 × 10–5 NH3/NHẠC1 HCIO 2.9 × 10–8 HC10/KCIO Submit Previous Answers v Correct The effective range for a buffering system is one pH unit on either side of pKa . Therefore, calculate the pKa for each buffer system. For HC2H3O2/KC2H3O2 - log Ka - log(1.8 x 10-9 pKa 4.74 For HC102/KC1O2 , pKa = 1.96 ; for HC10/KCIO , pKa= 7.54 ; and, for NH3/NH4C1 pKa = 14.00 — рКъ 14.00 – 4.754 9.25 So, HC10/KC1O is the best choice to create a buffer with pH = 7.30 because HC10 has the pKa value that is closest to 7.30. Part B For the best system, calculate the ratio of the masses of the buffer components required to make the buffer. Express your answer to two significant figures. i (3 ED ? Не Be m(KC10) = |0.578 m(HCIO) Submit Previous Answers Request Answer x Incorrect; Try Again; 2 attempts remaining
Transcribed Image Text:MISSED THIS? Read Section 18.3 (Pages 799 - 802) . The following table shows the values of ionization constants for a number of acids and bases at 25 °C : Which buffer system is the best choice to create a buffer with pH = 7.30 ? Formula Ка Kb HC1O2/KC1O2 HC2H302 1.8 × 10–5 HC102 HC2H302/KC2H3O2 1.1 x 10–2 NH3 1.76 × 10–5 NH3/NHẠC1 HCIO 2.9 × 10–8 HC10/KCIO Submit Previous Answers v Correct The effective range for a buffering system is one pH unit on either side of pKa . Therefore, calculate the pKa for each buffer system. For HC2H3O2/KC2H3O2 - log Ka - log(1.8 x 10-9 pKa 4.74 For HC102/KC1O2 , pKa = 1.96 ; for HC10/KCIO , pKa= 7.54 ; and, for NH3/NH4C1 pKa = 14.00 — рКъ 14.00 – 4.754 9.25 So, HC10/KC1O is the best choice to create a buffer with pH = 7.30 because HC10 has the pKa value that is closest to 7.30. Part B For the best system, calculate the ratio of the masses of the buffer components required to make the buffer. Express your answer to two significant figures. i (3 ED ? Не Be m(KC10) = |0.578 m(HCIO) Submit Previous Answers Request Answer x Incorrect; Try Again; 2 attempts remaining
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