$ Assignment Score: 3% X Question 3 of 33 Retention factors for three solutes separated on...

 

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$ Assignment Score: 3% X Question 3 of 33 Retention factors for three solutes separated on a C nonpolar stationary phase are shown in the table. The cluant was a citrate buffer:methanol mixture adjusted to pH with NH,, R Analyte Acetophenone Nicotine CH Analyte pH 8 Acetophenone 8.5 6.1 Nicotine Salicylic acid 1.1 Determine the major species of nicotine and salicylic acid present at each pH. The acetophenone structures are already placed as an example. A structure may appear in more than one position, and one or more structures may not be used. pk, values for salicylic acid are 2.97 and 13.6, and for nicotine are 3,15 and 7.85. 25 % 5 T P 6 Y ➜ pH 2 FT & 7 CH₂ CH₂ 00 U Resources 20 8 8 pH 5 1 C Give Up? CH₂ NH CH₂ DIM P10 ( 9 O pH 8 *- ) O Feedback PIE CH₂ CH₂ P pH 2 8.5 0.0 6,0 * FIZ 11. Try Again Attempt 1 pH 5 8.5 0.2 1.1 Answer Bank Pric + 11 O OH OH OH Insert Delete Backspe $ Assignment Score: 3% X Question 3 of 33 Retention factors for three solutes separated on a C nonpolar stationary phase are shown in the table. The cluant was a citrate buffer:methanol mixture adjusted to pH with NH,, R Analyte Acetophenone Nicotine CH Analyte pH 8 Acetophenone 8.5 6.1 Nicotine Salicylic acid 1.1 Determine the major species of nicotine and salicylic acid present at each pH. The acetophenone structures are already placed as an example. A structure may appear in more than one position, and one or more structures may not be used. pk, values for salicylic acid are 2.97 and 13.6, and for nicotine are 3,15 and 7.85. 25 % 5 T P 6 Y ➜ pH 2 FT & 7 CH₂ CH₂ 00 U Resources 20 8 8 pH 5 1 C Give Up? CH₂ NH CH₂ DIM P10 ( 9 O pH 8 *- ) O Feedback PIE CH₂ CH₂ P pH 2 8.5 0.0 6,0 * FIZ 11. Try Again Attempt 1 pH 5 8.5 0.2 1.1 Answer Bank Pric + 11 O OH OH OH Insert Delete Backspe

Answer rating: 100% (QA)

Nicotine pH 2 is smaller than pK values 315 785 s... View the full answer