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Exercise 3
Answer the questions below carefully!
1. As much as 20 mL of H PO solution has a pH = 4 - log 4,5, so
4
3
what are moles of the solution? (Ka H PO = 7,5 X 10
3
4
2. Butanoic acid, CH CH CH COOH is an organic acid. If 0,025 M
2
2
3
butanoic acid solution has pH = 3,12 at 25 C. Calculate the Ka
o
value of the acid!
3. What is the pH of 0,122 M monoprotic acid solution that has Ka
-4
= 5.7 × 10 ?
4. When the pH of a solution is 1, the concentration of hydronium
ions is 10 M = 0,1 M. Assume that the volume of this solution is
-1
500 mL. What is the pH after 500 mL of water is added?
-
+
5. What is the concentration of H , F , and HF 0,1 M? If it is known
that the degree of ionization HF = 8,4%.
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Bahasa Inggris Kimia (PKIM3139) 38
