19. Cyanic acid, HCNO(aq), is a weak acid that can be found in a variety of pesticides. A 0.100 mol/L solution of the acid is found to have ionized to 5.90%. What is the K₂ value for the acid? om is made with

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19. TM Cyanic acid, HCNO(aq), is a weak acid that can
be found in a variety of pesticides. A 0.100 mol/L
solution of the acid is found to have ionized to 5.90%.
What is the K₂ value for the acid?
20. A A 1.00 L volume of a buffer system is made with
ammonia, NH3(aq), and ammonium ion, NH4+ (aq),
both present in a concentration of 0.350 mol/L. If
0.100 mol/L of hydrochloric acid, HCl(aq), is added to
the 1 L solution, what is the change in pH of the
system?
21. T At a given temperature, 2.12 x 10-³ g of
magnesium fluoride, MgF₂(s), can dissolve in
125.00 mL of solution. Determine the Ksp for
magnesium fluoride at this temperature.
22.
TA You are given a solution that is either an acid or
a base. In testing the solution, you add bromocresol
green to a small sample of the solution, and the
solution turns green. When you add methyl red to a
small cample of the same solution, the solution turns
Transcribed Image Text:e H? 19. TM Cyanic acid, HCNO(aq), is a weak acid that can be found in a variety of pesticides. A 0.100 mol/L solution of the acid is found to have ionized to 5.90%. What is the K₂ value for the acid? 20. A A 1.00 L volume of a buffer system is made with ammonia, NH3(aq), and ammonium ion, NH4+ (aq), both present in a concentration of 0.350 mol/L. If 0.100 mol/L of hydrochloric acid, HCl(aq), is added to the 1 L solution, what is the change in pH of the system? 21. T At a given temperature, 2.12 x 10-³ g of magnesium fluoride, MgF₂(s), can dissolve in 125.00 mL of solution. Determine the Ksp for magnesium fluoride at this temperature. 22. TA You are given a solution that is either an acid or a base. In testing the solution, you add bromocresol green to a small sample of the solution, and the solution turns green. When you add methyl red to a small cample of the same solution, the solution turns
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