Koncentrētas slāpekļskābes un sālsskābes maisījumu tilpuma attiecībā 1:3 sauc par karaļūdeni, tam ir stipras oksidējošas īpašības, un tas šķīdina gan zeltu, gan platīnu.

Uzraksti elektronu bilances vienādojumus un izvieto koeficientus dotajā oksidēšanās-reducēšanās reakcijas shēmā!
$_\stackrel{0}{\mathrm{Pt}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}_{\stackrel{+1}{H}\stackrel{+5}{N}\stackrel{-2}{O}}_{3}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}_\stackrel{+1}{H}\stackrel{-1}{\mathrm{Cl}}\phantom{\rule{0.147em}{0ex}}\to \phantom{\rule{0.147em}{0ex}}_\stackrel{+4}{\mathrm{Pt}}\stackrel{-1}{{\mathrm{Cl}}_{4}}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}_\stackrel{+2}{N}\stackrel{-2}{O}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}_\stackrel{+1}{{H}_{2}}\stackrel{-2}{O}$
Svarīgi!
Virs elementa raksti lādiņu (+ vai -) un ciparu.
Atbilde:
$\begin{array}{l}\stackrel{ii}{i}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}i{\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}e}^{-}\phantom{\rule{0.147em}{0ex}}\to \phantom{\rule{0.147em}{0ex}}\stackrel{ii}{i}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}|\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}\\ \stackrel{i}{i}\phantom{\rule{0.147em}{0ex}}-\phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}{e}^{-}\phantom{\rule{0.147em}{0ex}}\to \phantom{\rule{0.147em}{0ex}}\stackrel{ii}{i}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.882em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}|\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}i\end{array}$

$i\stackrel{\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}0}{\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\mathrm{Pt}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}i{\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}H\stackrel{+5}{N}O}_{3}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\mathrm{HCl}\phantom{\rule{0.147em}{0ex}}\to \phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\stackrel{+4}{\mathrm{Pt}}{\mathrm{Cl}}_{4}\phantom{\rule{0.147em}{0ex}}+i\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\stackrel{+2}{N}O\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}{H}_{2}O$
Lai iesniegtu atbildi un redzētu rezultātus, Tev nepieciešams autorizēties. Lūdzu, ielogojies savā profilā vai reģistrējies portālā!