Question

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 KNO_{2}.

b. adding Mg(NO_{3})_{2}

c. adding HCl.

d. adding NH_{4}NO_{3}.

e. adding HNO_{2}.

Answer #1

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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b) Determine the concentrations of HNO2 and NaNO2 after addition
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Determine the concentrations of HNO2 and NaNO2 after addition of
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Part B
Determine the concentrations of HNO2 and NaNO2 after addition of
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