Four amino acid samples were subjected to a reverse-phase chromatography set up and yielded the following Rf values. Which among the samples is the most polar? Sample Rf values 0.49 0.53 0.21 0.55
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- The main constituents in vinegar are water and ethanoic acid (CH3COOH). In order to determine the concentration of acid in homemade vinegar, a student titrated 25 cm3 of 001 M NaOH against the vinegar. The equation for the reaction is: CH3COOH(aq) + NaOH(aq) ® CH3COONa(aq) + H2O(l) The following titration results were obtained: Burette readings (cm3) Rough 1 2 Final burette reading 20.10 38.90 31.40 Initial burette reading 0.10 20.00 12.50 Volume of vinegar used 20.00 18.90 18.90 (a) What volume of vinegar should be used in the calculation? (b) What is the mole ratio of NaOH:CH3COOH? (c) Calculate the number of moles of alkali in 25 cm3 of NaOH solution used. (d) How many moles of acid were used in the titration? (e) Calculate the…A 523.1-mg sample of impure KBr is treated with excess AgNO3 and 814.5 mg AgBr (187.774 g/mol) is obtained. What is the purity of the KBr (119.002 g/mol)?How many moles of KBr are there in 89.5 mL of 0.150 M KBr?
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