1-Match the acid/base pair that is suitable for preparing a buffer of each given
ID: 796764 • Letter: 1
Question
1-Match the acid/base pair that is suitable for preparing a buffer of each given approximate concentration. You will need to refer to Tables in the book of weak acids and bases and polyprotic acid - A. B. C. HCOOH/NaHCOO Read Answer Items for Question 1 - A. B. C. NaH2PO3/Na2HPO3 Read Answer Items for Question 1 - A. B. C. HOBr/NaOBr Read Answer Items for Question 1 Answer A. [H3O+] = 10-4 B. [H3O+] = 10-7 C. [H3O+] = 10-92-Which indicator would be the best to use for a titration between 0.30 M (CH3)2NH with 0.30 M HI? You will probably need to consult the appropriate table in the book. 1. phenol red, color change at pH 7-9 2. methyl red, color change at pH 4-6 3. bromothymol blue, color change at pH 6-8 4. thymol blue, color change at pH 8-10 5. alizarin yellow R, color change at pH 10-12
1-Match the acid/base pair that is suitable for preparing a buffer of each given approximate concentration. You will need to refer to Tables in the book of weak acids and bases and polyprotic acid HCOOH/NaHCOO NaH2PO3/Na2HPO3 HOBr/NaOBr Answer A. [H3O+] = 10-4 B. [H3O+] = 10-7 C. [H3O+] = 10-9
[H3O+] = 10-4 [H3O+] = 10-7 [H3O+] = 10-9 2-Which indicator would be the best to use for a titration between 0.30 M (CH3)2NH with 0.30 M HI? You will probably need to consult the appropriate table in the book. 1. phenol red, color change at pH 7-9 2. methyl red, color change at pH 4-6 3. bromothymol blue, color change at pH 6-8 4. thymol blue, color change at pH 8-10 5. alizarin yellow R, color change at pH 10-12 2-Which indicator would be the best to use for a titration between 0.30 M (CH3)2NH with 0.30 M HI? You will probably need to consult the appropriate table in the book. phenol red, color change at pH 7-9 methyl red, color change at pH 4-6 bromothymol blue, color change at pH 6-8 thymol blue, color change at pH 8-10 alizarin yellow R, color change at pH 10-12
- A. B. C. HCOOH/NaHCOO Read Answer Items for Question 1 - A. B. C. NaH2PO3/Na2HPO3 Read Answer Items for Question 1 - A. B. C. HOBr/NaOBr Read Answer Items for Question 1 Answer A. [H3O+] = 10-4 B. [H3O+] = 10-7 C. [H3O+] = 10-9
2-Which indicator would be the best to use for a titration between 0.30 M (CH3)2NH with 0.30 M HI? You will probably need to consult the appropriate table in the book. 1. phenol red, color change at pH 7-9 2. methyl red, color change at pH 4-6 3. bromothymol blue, color change at pH 6-8 4. thymol blue, color change at pH 8-10 5. alizarin yellow R, color change at pH 10-12
Explanation / Answer
HCOOH/NaHCOO.............[H3O+] = 10-4
NaH2PO3/Na2HPO3...............[H3O+] = 10-7
HOBr/NaOBr...........[H3O+] = 10-9
2)
alizarin yellow R, color change at pH 10-12
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