Exam 12: Acids and Bases

The fractional composition diagram for the amino acid alanine is given below. Write the structure of the dominant species at pH 1,6,and 12,respectively.

Which of the following is the strongest base?

Which of the following is the strongest acid?

The conjugate base of ammonia is

The pH of 0.010 M aniline(aq)is 8.32.What is the percentage aniline protonated?

In a solution labeled "0.0018 M barium hydroxide" what is the molarity of OH^-?

The following 0.1 M aqueous solutions are arranged in order of increasing pH,with the highest pH on the far right. Which one of the following 0.10 M aqueous solutions should be placed in the empty box?

Of the following,which is the strongest acid?

For a solution labeled "0.10 M H₃PO₄(aq),"

When CaO(s)is dissolved in water,which of the following is true?

Which of the following is the weakest acid?

Write the autoprotolysis reaction for liquid ammonia.

The K_a of phenol is 1.3 * 10^-10.For a solution labeled "1.0 * 10^-3 M aqueous phenol,"

The amino acid alanine,HOOC-CH(CH₃)NH₃⁺,has K_a1 = 4.5 * 10^-3 and K_a2 = 1.4 * 10^-10.Calculate $\alpha$ (^-OOC-CH(CH₃)NH₃⁺)at pH 3.

What is the conjugate base of H₂PO₄^- ?

All of the following acids have the same strength in water except

The amino acid methionine,HOOC-CH(CH₂CH₂SCH₃)NH₃⁺,has pK_a1 = 2.2 and pK_a2 = 9.1.If this amino acid is represented by H₂L⁺,the major species at pH 6 is

Strong acids are leveled in water to the strength of the acid H₃O⁺.

Write the charge balance equation for a solution that is 0.0010 M phenol(aq).Let phenol be represented by HA(aq).

The pH of 0.010 M H₃PO₄(aq)is 2.24; estimate the concentration of PO₄^3- in the solution.For H₃PO₄,the values of K_a1,K_a2,and K_a3 are 7.6 *10^-3,6.2 * 10^-8,and 2.1 * 10^-13,respectively.