3) A) Calculate the pH of a buffer solution which contains the weak monoprotic acid, propanoic acid (CH3CH₂COOH), in concentration 0.1 mol/L and sodium propanoate in concentration 0.05 mol/L. K₂ of propanoic acid is 1.26 x 105 mol/L. B) Give equations to show how the above solution fulfills its buffer function.

Question 4. In the course material you have been introduced to multiple charging for electrospray spectra. Each peak in the spectrum below can be used to provide a measure of the mass of this protein, you can work out the charge associated with each peak, and measures can be averaged to find the overall mass. Use simultaneous equations to find the charge associated with each peak in the spectra below, which will allow you to calculate the average mass of each species. Include an estimate of the error associated with this measure. x105 659.8 714.7 779.5 857.4 952.6 1000 Page 3 of 3 1071.5 1100 1200 1300 +MS, 01-13min (779) myz

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Part B il Spell out the full name of the compound. Submit Previous Answers Request Answer X Incorrect; Try Again Part C Spell out the full name of the compound. Submit Request Answer Part D CI Spell out the full name of the compound. Submit Request Answer