Activity For each pair of substances do the followin 1) What is the identity of

Question

Activity For each pair of substances do the followin 1) What is the identity of the two species in each set (strong acid/strong base/weak acid/weak base/salt/other) and explain your reasoning. 2) Identify if there is anything in common between the two species in each set and underline that portion. 3) How do you think the two species in each set are related to each other? Justify your answer. 4) If there is a weak acid or a weak base present (NOT a significant conjugate acid or a significant conjugate base)? If there is write out the equation relating the two species in each set (HINT: think about writing an equation for the dissociation of the weak acid or the weak base). 5) If applicable, label the species your equation as a weak acid and its conjugate base or a weak base and its conjugate acid. 6) Determine the Ka for the acid species (ifyou are dealing with a weak base how could you possibly find a Ka for the acid species in the equation?) 7) Could this mixture possibly be a buffer? Why?

Explanation / Answer

c) Citric acid and lithium propanoate

1) Citric acid a weak acid HC6H7O7

lithium propanoate is a conjugate base of propanoic acid (NaC2H5CO2Na)

weak acid/salt

2) No common between the two species

3) no relation, they beong to two different species

4) Equation cannot be written for the pair

7) No buffer

d) Methyl amine and methylammonium chloride

1) weak base/salt

2) Both are base and conjugate acid of CH3NH3

3) CH3NH3Cl is a conjugate acid of wek base CH3NH2

4) Equation,

             CH3NH2 + H2O <==> CH3NH3+ + OH-

           weak base                conjugate acid

5) labels above

6) Kb = [CH3NH3+][OH-]/[CH3NH2]

7) this solution can form buffer

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