Ответы на вопрос:
a) ca(oh)₂+2hno₃→ca(no₃)₂+2h₂o
2+ - + - 2+ -
ca+2oh+2h+2no3→ca+2no₃+2h₂o
- +
2oh+2h→2h2o
б) alcl₃+3koh→al(oh₃)↓+3kcl
3+ - + - + -
al+3cl+3k+3oh→al(oh₃)↓+3k+3cl
3+ -
al+3oh→al(oh₃)↓
в) k₂co₃+2hcl→ 2kcl+ h₂o +co₂↑
+ 2- + - + -
2k+co₃+2h+2cl→ 2k+2cl+ h₂o +co₂↑
2- +
co₃+2h→ h₂o +co₂↑
г) 3mgso₄+ 2k₃po₄→mg₃(po₄)₂↓+ 3k₂so₄
2+ 2- + 3- + 2-
3mg+3so4+6k+2po4→mg₃(po₄)₂↓+3k+3so4
2+ 3-
3mg+2po4→mg₃(po₄)₂↓
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