Question

For each of the following compounds, indicate whether aM aqueous solution is acidic (pH ,), basic (pH .), or neutral (pH):, , , , .

Short answer

Answer

The solution of HCL is acidic.

The solution of$N{H}_{4}CI$ is acidic.

The solution of $KN{O}_3$is acidic.

The solution of $N{a}_{3_{}}P{O}_4$is basic.

The solution of $NaC{H}_{3}COO$is basic

Step-by-step solution

Determine type of the solution .

The dissociation of is as follows:

The of is:

Determine the type of the solution NH4CI.

The reactions of $$\begin{gathered} N{H}_{4}CIare \\ N{H}_{4}CL\to N{H^{+}}_4+C{I}^{-} \\ N{H}_4^{+}+H_{2}0\to N{H}_3+H_3{O}^{+} \\ The\hspace{0.17em}{K}_{a}ofN{H}_{4}CIis: \\ {K}_a=\frac{\left[NH\_3\right]\left[H\_{30}^{+}\right]}{\left[NH\_4^{+}\right]} \\ 5.8.{10}^{-10}=\frac{X{2}^{}}{0.1-X} \end{gathered}$$

$$\begin{gathered} x^2+5.8.{10}^{-10}x-5.8.{10}^{-11}=0 \\ x=7.62.{10}^{-6}M=\left[H\right] \\ ThepHis: \\ pH=-\log \left(\right[H\left]\right) \\ =-\log (7.62-{10}^{-8}) \\ =5.12 \\ ThesolutionofN{H}_{4}CIacidicaspH<7. \end{gathered}$$