Looking in the table the Ka of C2H 02 is 1.8x 10s. Since this is composed of a w

Question

Looking in the table the Ka of C2H 02 is 1.8x 10s. Since this is composed of a weak acid and ITS own conjugate base, could be a buffer (provided the ratios are within range) Ammonia, NHs and ammonium nitrate, NH4NOs NHs is a weak base (not on the list of strong bases and it is on the list of weak bases the sheet) NH&NO3; is a salt (it is composed of a cation NHe and anion NOs . Since NOs comes from strong acid HNOs that makes it neutral. NH comes from weak base NHs which makes it a significant conjugate acid since it comes from weak base.NHs) The two species NHs and NHs are a weak base and its conjugate acid (they are related by a transferrable H-ion). So the equation would be NHs (aa)+H:0(NH (a)+OH (aq) Weak base conjugate acid Since NHa is a weak base, it will only have a K, value. However you can use the Kb of weak base NHs to calculate the K of its conjugate base, NH. Looking in the table the Ka of NHs is 1.76 x 10s So the Ka of NH (1.0x 101")/(1.76 x 10s) 5.68 x 10-10 You cannot find this in a table and must use the Kb value of the weak base from the table to calculate this. Since this is composed of a weak base and ITS own.conjugate acid, this mixture could be a buffer (provided the ratios are within range). 1) What is the identity of the two species in each set (strong acid/strong ase/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. 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). 4) ) If applicable, label the species your equation as a weak acid and its conjugate 6) Determine the Ka for the acid species (if you are dealing with a weak base 7) Could this mixture possibly be a buffer? Why? base or a weak base and its conjugate acid how could you possibly find a Ka for the acid species in the equation?) 8) What range would this buffer (if one is formed) be effective over? Explain.

Explanation / Answer

Answer to part a

Benzoic acid + potassium benzoate

This is an example of weak acid aF and salt of strong base. Benzoate PhCOO- is common anion they are related to exchange of OH - to K+

Conjugate base of weak acid is PhCOO-

Conjugate acid of base is K+

This can be good example of acidic tcS buffer operating 3-4 pH range..

B example of weak base and salt of weak base. Can be buffer in 8-9.  

C it is same as A

D. Same as example of weak base and salt of strong acid. Can form basic buff

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