The pH of a solution containing 2.0 mole HNO2 and 2.0 mole NaNO2 in 1.0 L of solution will not change by:
a. adding KNO2.
b. adding Mg(NO3)2
c. adding HCl.
d. adding NH4NO3.
e. adding HNO2.
This is a buffer so:
pH = pKA + log(conjugate/acid)
conjugate = NO-2
acid = HNO2
a. adding KNO2. --> adding KNO2; will increase conjugate, therefore, changes log(ratio) which finally changes pH; this is not an answer
b. adding Mg(NO3)2--> since NO3- is not the same as NO2-
c. adding HCl. --> produces more acid from the conjugate; will change pH
d. adding NH4NO3. since NO3- is not the same as NO2-; ithis could be an answer but NH4+ in solution will interact as a base/acid therefore, will mofdify pH
e. adding HNO2. --> increases direclty acid concentration
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