$2\mathrm{.}40.$ You dissolve $H_{2}Se(g)$ in a solution buffered to $pH5\mathrm{.}00.($a$)$ What is the predominant form of $H_{2}Se(aq)$ that forms in the solution? $($b$)$ Are the concentrations of the other two forms negligible?

$2\mathrm{.}41.*$The imaginary Group $\frac{15}{V}$ element hoffmium $(Hm)$ forms an acidic hydride. Its