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Need help with below Question. Citric acid (which we can abbreviate as H3Cit) is a triprotic...

Need help with below Question.

Citric acid (which we can abbreviate as H3Cit) is a triprotic carboxylic acid with the following acidity constants pKa1 = 3.128, pKa2 =4.761, and pKa3 = 6.396.

a) A solution is made by adding lemon juice to water until the pH is 2.20. Assuming all the acidity is from dissociation of citric acid, find the total concentration of citrate species (i.e., TOTCit) and the concentration of HCit2-.

b) The solution in part (a) is diluted 1:10 and partly neutralized by addition of sodium bicarbonate (NaHCO3). Designating the total concentration of carbonate species added as TOTCO3, write out all the equations necessary to compute the new pH. You do NOT need to solve the equations.

c) If the final pH is 6.0, what is the ratio of (HCO3-) to (H2CO3) in the solution? What is the ratio of (CO32-) to (H2CO3)? Would these ratios change if the pH were still 6.0, but TOTCit were doubled?

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Answer #1

거구yrz み-Y 거 .4 t り.? 거 w. -27 2·フ 2.2. -4.761-6, 39 ổ C,hol γα co 3 И,СО, @ C 2 2 l O

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