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which of the following represent a buffer system?
A.) NaOH and NaBr
B.) HF and NaF
C.) HC2H3O2 and C12H22O11
D.) HCl and KOH


    A buffer is
    a. a weak acid mixed with a salt of the weak acid. (example: acetic acid and sodium acetate)
    b. a weak base mixed with a salt of the weak base. (example: NH3 + NH4Cl)
    c. a combination of salts/acids OR salts/bases that produce either a or b above. (examples: HCl + excess sodium acetate OR NaOH + excess NH4Cl)

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