Question 19 In a solution prepared by dissolving 0.100 mole of propanoic acid in enough water to make 1.00 L of solution, the pH is observed to be 2.945. The K, for propanoic acid (HC3H;O2) is a) 1.14 x 10-3 b) 1.30 x 10-5 c) 1.15 x 10-2 d) 7.67 x 10-1o e) none of these Question 20 Calculate the percentage of pyridine (CSHŞN) that forms pyridinium ion, CSH&N*, in a 0.89 M aqueous solution of pyridine (K, = 1.7 x 10-9). a) 1.7 x 10-7% b) 3.9 x 10-3% c) 1.9 x 10-7% d) 4.9 x 10-3%

What hydrogen does peak 5 correspond to?

identify the groups of homotopic protons and from these, the group with the lowest and the group with the highest shift values. Give an estimate for these shift values.

Draw the instrumentation of ATR spectroscopy?  Please answer at your own words.

Which molecule matches this mass spectrum

What is the 'H NMR splitting pattern of the indicated hydrogen? singlet doublet

Please help

Isoamyl acetate: Match the peaks to the appropriate number on the structure. A letter may correspond to more than one number. e a b с d 3H 1.7 PPM 1 4 3 3.5 3.0 2.5 2.0 1.5 1.0 0.5 PPM за 1. 1 3 d 2. 2 2 e 3. 3 4 f 4. 4 4 c 5. 5 _1 b

When we perform Bradford Assay to measure protein concentration, the spectrophotometer is set  595 nm because:    a.  the excitation peak of Coomassie Blue is best observed at 595 nm   b.  when Coomassie Blue binds to proteins, its maximum absorbance shifts to 595 nm   c.  the reducing effects of Coomassie Blue shifts the protein's maximum absorbance to 595 nm   d.  myoglobin is best observed at 595 nm