CHEM化學equation問題(簡易拎20分)

👨🏻‍🏫 學術台化學

[匿名]

2008-04-14 11:21 pm

1) HCl + Pb(NO3)2 = ?

2) dil. H2So4 + BaCl = ?

3)dil.H2SO4 +Zn(NO3)2 = ?

4)precipitation reaction 既出現條件係咩 ????????

唔該晒~~~~~~~~~~~~~~~~~~~~~~~~

更新1:

補充一問~~~~~~~~~1) 2) 3) 分別係邊類化學反應

回答 (2)

cindy

2008-04-14 11:46 pm

✔ 最佳答案

1)2HCl + Pb(NO3)2 →PbCl2+2HNO3
* PbCl2 is insoluble in cold water BUT soluble in hot water
2) dil. H2SO4 + BaCl2→BaSO4+2HCl
*BaSO4 is insoluble in acids
3)dil.H2SO4 +Zn(NO3)2→ZnSO4+2HNO3

4)insoluble salt

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roy

2008-04-15 8:36 am

1 2HCl + Pb(NO3)2 --> PbCl2+2HNO3

2 dil. H2SO4 + BaCl2 --> BaSO4+2HCl

3 dil.H2SO4 +Zn(NO3)2 --> ZnSO4+2HNO3

4 the formation of insoluble salt from the reactants

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