Marshal/Downloads/Acids,%20Bases%205 alts%20an Lab%20Assgnment%20(2).pdf 1. The

Question

Marshal/Downloads/Acids,%20Bases%205 alts%20an Lab%20Assgnment%20(2).pdf 1. The stronger an acd, the , its conjugate base. Write a balanoed chemkcal equation for the lonization of nitric add in water. 2. a. Is nitric acid a (strong /weak) acid? b. Will this ionization go to completion or not? c. Which spedes is the conjugate base of nitric acid? d. Is the conjugate base of nitric acid a (strong /weak) base? (Cirdle one) As it turns out, anions of strong acids are such weak bases that they have virtually no effect on the pH of solution. Make a list of the anions of the six strong monoprotic acids discussed in lecture. These anions are said to have no effect on the pH of an aqueous solution. 3. The some is true for solutions of strong bases- their conjugate acids (which are Group 1 or Group 2 cations) are very weak acids, and therefore, have virtually no effect on the pH of the solution Make a list Group 1 and Group 2 cations, and note that these ions are said to have no effect on the pH of an aqueous solution with the exception of Be 4. The situation is different, however, for the conjugate acid of a weak base, or the conjugate base of a weak acid A weak base: Write a balanced equation for the protonation of ammonia, using water as a reactant. 5. a. What species is the conjugate acid of ammonia? b. The Ke of ammonia is 1.8 x 10 What is the Ko of its conjugate acid? Show work. 6. Hypoiodous aod (HIO) has K -2.3x 10, Which is a stronger aod, HIO or NH Explain your reasoning.

Explanation / Answer

1) The stronger tha acid , the weaker is its conjugate base.

2)The balanced equation for ionisation of nitric acid in water is

HNO3(aq) + H2O(l) -------------> H3O+ (aq) + NO3-(aq)

a) Nitric acid is a strong acid

b) The ionization of nitric acid is compete.

c)The conjugate base of nitric acid is nitrate ionNO3-

A conjugate base is formed by the loss of a H+ from acid.

d) the conjugate base of nitric acid is a weak base.

3)six strong monoprotic acids are

Acid Its conjugate base

HCl Cl-

HBr Br-

HNO3 NO3-

HClO4 ClO4-

HI I-

HSo4- So4-2

4) Group I cations Li+,Na+ , K+, Rb+ and Cs+

Group II cations Mg+2, Sr+2, Ca+2, Ba+2

5)The protonation of ammonia in water is

NH3(aq) + H2O(l) <-------------> NH4+(aq) + OH-(aq)

a) The conjugte acid of ammonia is NH4+

b)kb of ammonia = 1.8x10-5

we know that the kb of base and Ka of its conjugate acid are related as

Kb of base x Ka of conjugate acid = Kw

Thus ka of conjugate acid of NH3 = kw/kb

= 1.0x10-14 /1.8x10-5

= 5.55x10-10

6) Given ka of HIO =2.3x10-12

As the Ka of HIO is less than ka of NH4+ ( 5.55x10-10 ) HIO is weaker than NH4+

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