Verify Hypobromous acid, HBrO, is a weak acid. Ka = 2.8 x 10-9 a. Write the equilibrium expression (including water as a reactant) and identify the two conjugate acid-base pairs according to B-L theory. b. In part a, you should have identified BrOas the conjugate base of HBrO. Write this equilibrium expression showing BrO acting as abase in a reaction with water (note that HBrO is now a product) c. Calculate the Kb from the above Ka using Kw. d. So, the Kb is larger than the Ka which might mean that the 5% rule (a small “x”) might not work, Assume an initial concentration of BrO- of 0.015 M. Calculate the pH of the solution and explain whetherthe 5% rule applies or if the quadratic formula is needed. Solve for x.
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Chemical equilibrium and ionic equilibrium are two major concepts in chemistry. Ionic equilibrium deals with the equilibrium involved in an ionization process while chemical equilibrium deals with the equilibrium during a chemical change. Ionic equilibrium is established between the ions and unionized species in a system. Understanding the concept of ionic equilibrium is very important to answer the questions related to certain chemical reactions in chemistry.
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Verify Hypobromous acid, HBrO, is a weak acid. Ka = 2.8 x 10-9
a. Write the equilibrium expression (including water as a reactant) and identify the two conjugate acid-base pairs according to B-L theory.
b. In part a, you should have identified BrOas the conjugate base of HBrO. Write this equilibrium expression showing BrO acting as a
base in a reaction with water (note that HBrO is now a product)
c. Calculate the Kb from the above Ka using Kw.
d. So, the Kb is larger than the Ka which might mean that the 5% rule (a small “x”) might not work, Assume an initial concentration of BrO- of 0.015 M. Calculate the pH of the solution and explain whether
the 5% rule applies or if the quadratic formula is needed. Solve for x.
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