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847 и 848

847.

а) CuO→CuSO₄→Cu(OH)₂→CuO→CuCI₂→Cu(OH)₂

CuO+H₂SO₄=CuSO₄+H₂O

CuSO₄+2NaOH=Cu(OH)₂↓+Na₂SO₄

Cu(OH)₂=CuO+H₂O

CuO+2HCI=CuCI₂+H₂O

CuCI₂+2NaOH=Cu(OH)₂↓+NaCI

б)Ba→BaO→Ba(OH)₂→Ba(NO₃)₂→Ba₃(PO₄)₂

2Ba+O₂=2BaO

BaO+H₂O=Ba(OH)₂

Ba(OH)₂+2HNO₃=Ba(NO₃)₂+2H₂O

3Ba(NO₃)₂+2H₃PO₄=Ba₃(PO₄)₂↓+6HNO₃

в)Fe₂O₃→Fe→FeCI₂→FeSO₄→Fe(OH)₂→FeO→FeSO₄

2Fe₂O₃+3C=4Fe+3CO₂↑

Fe+2HCI=FeCI₂+H₂↑

FeCI₂+H₂SO₄=FeSO₄+2HCI

FeSO₄+2NaOH=Fe(OH)₂↓+Na₂SO₄

Fe(OH)₂=FeO+H₂O

FeO+H₂SO₄=FeSO₄+H₂O

848.

Ca+H₂O=Ca(OH)₂

Ca+SO₂=CaSO₃

Ca+2AgCI=CaCI₂+2Ag↓

3Ca+2H₃PO₄=Ca₃(PO₄)₂↓+3H₂↑

H₂O+SO₂=H₂SO₃

H₂O+Na₂O=2NaOH

SO₂+Na₂O=Na₂SO₃

SO₂+Ba(OH)₂=BaSO₃+H₂O

3Ba(OH)₂+2H₃PO₄=Ba₃(PO₄)₂↓+6H₂O