On a shelf in the laboratory are 0.100 M solutions of the following reagents: ac

Question

On a shelf in the laboratory are 0.100 M solutions of the following reagents: acetic acid, HC2H3O2 ammonia, NH3 ammonium nitrate, NH4NO3 hydrochloric acid, HCl phosphoric acid, H3PO4 sodium bisulfite, NaHSO3 sodium chloride, NaCl sodium hydrogen phosphate, Na2HPO4 sodium hydroxide, NaOH sodium sulfite, Na2SO3 sulfurous acid, H2SO3 Which of the reagents would you choose

a) To make a buffer with pH = 9.00 ?

b) To make a buffer with pH = 2.00 ?

c) To make a buffer with pH = 7.00 ?

d) (5 pts. extra credit) To make a buffer with pH = 5.00 ?

Explanation / Answer

A)Buffer with pH=9.00 means basic buffer:- it consist of a weak base and it's salt with strong acid.

Here NH3+ it's salt with NH4NO3

B) buffer with pH=2 means acidic buffer :- it consist of weak acid and it salt with strong base.

H2SO3(pka1=1.92)+it's salt NaHSO3

C) buffer with pH=7 means salt of strong acid and strong base:- NaCl,Na2SO3

D) buffer with pH 5:- hence here noumber of dissociate mole of reagents, and dissociation constants is not giving so on the basis of strength of acid and it's salt with base we can say that solutions of H3PO4+Na2HPO4

H2SO3+NaHSO3

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