ZnCl2 + H2O → ZnOHCl + HCl
Zn2+ + H2O →(ZnOH)+ + HCl
ZnOHCl + H2O → Zn (OH)2 + HCl
(ZnOH)+ + H2O → Zn(OH)2 + H2
; Zn2+ - - . ZnOHCl HCl. Zn(OH)2 . , .
+ ( < 7).
. . h, .
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no no , .
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Al2S3 H2S Al(OH)3. Al2S3 .
Al2S3 + 6H2O = 2Al(OH)3 ↓ + H2S↑
, :
2 CrCl3 + 3N a2S = Cr2S3 + 6NaCl
Cr2S3 + 6 H2O = 2Cr(OH)3↓ + 3H2S↑
,
2CrCl3 + 3Na2S + 6H2O = 2Cr(OH)3↓ + 6NfCl + 3H2S↑
2Cr3+ + 3S2- 6 H2O = 2Cr(OH)3↓ + 3H2S↑
, , :
2FeCl3 + 3Na2CO3 + 3H2O = 2Fe(OH)3↓ + 3 CO2↑ + 6 NaCl
2Fe3- + 3CO32- + 3H2O = 2Fe(OH)3↓ + 3CO2↑
1. ?
2. ; ?
3. ? ?
4. , K2S KNO2?
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5. , - : () MnCl2, K2CO3, KCl, NaNO3, NH4NO3, Ba(CH3COO)2, Na2S?
6. (), ?
7. , AlCl3 K2S, , Al2S3 .
8. Al2(SO4)3 Na2CO3 Al(OH)3. .
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