<span>a)
</span><span>Cu → Cu (NO3)2 → CuO → Cu (NO3)2</span>
<span>Cu + 4HNO3→ 2H2O + 2NO2 + Cu (NO3)2</span>
<span><span>2Cu(NO3)2 </span><span /><span>2CuO + 4NO2 + O2</span></span>
<span>CuO + 2HNO3→ Cu (NO3)2
+ 2H2O </span>
Б) сульфат аммония и гидроксид калия
(<span>NH4</span><span>)2</span><span>SO4</span> + 2КОН → 2<span>NH4</span>ОН+ К2<span>SO4</span>
Сульфат аммония и вода;
<span>(<span>NH4</span>)2<span>SO4</span></span><span><span>+ 4Н2О </span></span>→<span>2<span>NH4</span>ОН</span><span><span>+ Н2</span></span><span>SO4</span>