135. What relative masses of dimethyl amine and dimethyl ammo- nium chloride do you need to prepare a buffer solution of pH = 10.43?

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Preparing Buffer Solutions: Calculating the Volume of Weak Base Needed Use the table of K values given with this problem to choose the best weak base to start from for making a buffer that holds the pH of the solution at 4.70. Make your selection so that you maximize the capacity of the buffer. Assume that you want to make 100 mL of a buffer and you have already added enough of the conjugate acid salt to make the final buffer 0.30 M in this salt. How many mL of a 3.6 M solution of the weak base you selected must be added to the volumetric flask so that when filled to the mark, the pH of the buffer will equal 4.70. .09 Incorrect: Your answer is incorrect. mL Weak Base Kb NH3 (Ammonia) 1.76 X 10-5 C6H5NH2 (Aniline) 3.9 X 10-10 (CH3CH2)2NH (Diethyl amine) 6.9 X 10-4 C5H5N (Pyridine) 1.7 X 10-9 CH3CH2NH2 (Ethyl amine) 5.6 X 10-4 (CH3)3N (Trimethyl amine) 6.4 X 10-5 (CH3)2NH (Dimethyl amine) 5.4 X 10-4

The following questions apply to separation of a solution containing pentanol (FM 88.15) and 2,3-dimethyl-2-butanol (FM 102.17). Pentanol is the internal standard.(a) Separation of a standard solution containing 231 mg of pentanol and 259 mg of 2,3-dimethyl-2-butanol in 10.0 mL of solution led to a pentanol:2,3-dimethyl-2-butanol relative peak area ratio of 0.909:1.00. Calculate the response factor, F, for 2,3-dimethyl-2-butanol.

(b) Calculate the areas for pentanol and 2,3-dimethyl-2-butanol gas chromatogram peaks in an unknown. For pentanol, the peak height was 61.5 mm and the width at half-height was 3.0 mm. For 2,3-dimethyl-2-butanol, the peak height was 79.6 mm and the width at half-height was 3.5 mm. Assume each peak to be a Gaussian.

(c) If the concentration of pentanol in the unknown solution of part (b) was 73.9 mM, what was the 2,3-dimethyl-2-butanol concentration?