**Step 1:** Determine the number of moles.

$\mathbf{moles}\mathbf{}{\mathbf{HNO}}_{\mathbf{2}}\mathbf{=}\mathbf{1}\mathbf{.}\mathbf{00}\mathbf{}\overline{)\mathbf{L}}\mathbf{\left(}\frac{\mathbf{0}\mathbf{.}\mathbf{125}\mathbf{}\mathbf{mol}\mathbf{}{\mathbf{HNO}}_{\mathbf{2}}}{\overline{)\mathbf{L}}}\mathbf{\right)}\mathbf{=}$**0.125 mol**

$\mathbf{moles}\mathbf{}{\mathbf{NaNO}}_{\mathbf{2}}\mathbf{=}\mathbf{1}\mathbf{.}\mathbf{00}\mathbf{}\overline{)\mathbf{L}}\mathbf{\left(}\frac{\mathbf{0}\mathbf{.}\mathbf{175}\mathbf{}\mathbf{mol}\mathbf{}{\mathbf{NaNO}}_{\mathbf{2}}}{\overline{)\mathbf{L}}}\mathbf{\right)}\mathbf{=}$**0.175 mol**

$\mathbf{moles}\mathbf{}\mathbf{HCl}\mathbf{=}\mathbf{1}\mathbf{.}\mathbf{60}\mathbf{}\overline{)\mathbf{g}\mathbf{}\mathbf{HCl}}\left(\frac{1\mathrm{mol}\mathrm{HCl}}{36.46\overline{)g\mathrm{HCl}}}\right)\mathbf{=}$**0.044 mol**

**Step 2**: Construct an ICF Chart.

A 1.0-L buffer solution is 0.125 *M* in HNO_{2} and 0.175 *M* in NaNO_{2}. Determine the concentrations of HNO_{2} and NaNO_{2} after addition of 1.6 g HCl.

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