Answer:
The first element of periodic
table is hydrogen. It reacts with oxygen and forms water. The solid state of
water, i.e., ice floats on liquid water as it has lower density than liquid water.
Water acts as an acid as well as
base. Water behaves as an acid towards ammonia and behaves as a base towards hydrochloric
acid.
\[\underset{Base}{\mathop{N{{H}_{3}}}}\,+\underset{Acid}{\mathop{{{H}_{2}}O}}\,\to
\underset{Acid}{\mathop{NH_{4}^{+}(aq)}}\,+\underset{Base}{\mathop{O{{H}^{-}}(aq)}}\,\]
\[\underset{Acid}{\mathop{HCl}}\,+\underset{Base}{\mathop{{{H}_{2}}O}}\,\to
\underset{Base}{\mathop{C{{l}^{-}}(aq)}}\,+\underset{Acid}{\mathop{{{H}_{3}}{{O}^{+}}(aq)}}\,\]
In the autoionisation, acid,
base are formed.
\[\underset{Acid}{\mathop{{{H}_{2}}O}}\,+\underset{Base}{\mathop{{{H}_{2}}O}}\,\to
\underset{\begin{smallmatrix}
Acid \\
Hydronium
\\
ion
\end{smallmatrix}}{\mathop{{{H}_{3}}{{O}^{+}}}}\,+\underset{\begin{smallmatrix}
Base \\
Hydroxyl
\\
ion
\end{smallmatrix}}{\mathop{O{{H}^{-}}}}\,\]
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