2. Based on properties of weak acid/base ions, on the lines to the left of each
ID: 928191 • Letter: 2
Question
2. Based on properties of weak acid/base ions, on the lines to the left of each lettered salt solution identify the type of hydrolysis, acidic (A) or basic (B), that each salt undergoes. On the line on the right identify the weak acid or base ion that causes the predicted type of hydrolysis.
Type of Hydrolysis Weak Base or Acid Ion
_____ A. NaC2H3O2 sodium acetate _________
_____ B. Na2CO3 sodium carbonate _________
_____ C. NaHSO4 sodium hydrogen sulfate _________
_____ D. NaHCO3 sodium hydrogen carbonate _________
_____ E. NH4Cl ammonium chloride _________
_____ F AlCl3 aluminium chloride _________
3. Calculate the pH of a buffer made by mixing 50.0 mL of 0.10 M acetic acid (HC2H3O2) with 50.0 mL of 0.10 M sodium acetate (NaC2H3O2). The Ka for acetic acid is 1.8 x 10 –5 . Use the Henderson-Hasselbalch equation: pH = pKa + log([base]/[acid])
Explanation / Answer
2.
A.) Basic, anionic
B) Basic, anionic
C) Acidic, Cationic
D) Acidic , cationic
E) Acidic, cationic
F) Acidic , cationic
3.
pH = pKa + log[base]/[acid]
pH = 4.74 + log(0.10/0.10)
pH = 4.74
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