Questions: species relative pH of 0.1 M aqueous solution --- --- HF (Choose one) ∇ H3O+ (Choose one) 7 HCN 4 F 6 CN- (Choose one) HNO2 3 H2O 5 NO2- (Choose one) ∇

Transcript text: \begin{tabular}{|c|c|} \hline species & \begin{tabular}{l} relative pH of \\ 0.1 M aqueous solution \end{tabular} \\ \hline HF & (Choose one) $\boldsymbol{\nabla}$ \\ \hline $\mathrm{H}_{3} \mathrm{O}^{+}$ & (Choose one) 7 \\ \hline HCN & 4 \\ \hline F & 6 \\ \hline $\mathrm{CN}^{-}$ & (Choose one) $\$ \\ \hline $\mathrm{HNO}_{2}$ & 3 \\ \hline $\mathrm{H}_{2} \mathrm{O}$ & 5 \\ \hline $\mathrm{NO}_{2}^{-}$ & (Choose one) $\boldsymbol{\nabla}$ \\ \hline \end{tabular}

Solution

Solution Steps

Step 1: Identify the missing pH values

We need to determine the relative pH values for HF, $\mathrm{H}_{3} \mathrm{O}^{+}$, $\mathrm{CN}^{-}$, and $\mathrm{NO}_{2}^{-}$.

Step 2: Analyze the given pH values

$\mathrm{H}_{3} \mathrm{O}^{+}$ has a pH of 7, which is neutral.
HCN has a pH of 4, indicating it is a weak acid.
F has a pH of 6, indicating it is slightly acidic.
$\mathrm{HNO}_{2}$ has a pH of 3, indicating it is a stronger acid than HCN.
$\mathrm{H}_{2} \mathrm{O}$ has a pH of 5, which is neutral but slightly acidic.
$\mathrm{NO}_{2}^{-}$ and HF are missing pH values.

Step 3: Determine the pH values for the missing species

HF is a weak acid, so its pH should be less than 7 but more than 3. Given the other values, it is likely around 5.
$\mathrm{CN}^{-}$ is a weak base, so its pH should be more than 7.
$\mathrm{NO}_{2}^{-}$ is also a weak base, so its pH should be more than 7.