(1)向酸性高锰酸钾溶液中通入二氧化硫气体,高锰酸钾被还原为硫酸锰,
其离子反应为5SO
2+2MnO
4-+2H
2O=2Mn
2++5SO
42-+4H
+,
故答案为:5SO
2+2MnO
4-+2H
2O=2Mn
2++5SO
42-+4H
+;
(2)向酸性硫酸亚铁溶液中滴加过量双氧水的离子反应为2Fe
2++H
2O
2+2H
+=2Fe
3++2H
2O,
故答案为:2Fe
2++H
2O
2+2H
+=2Fe
3++2H
2O;
(3)向溴化亚铁溶液中通入等物质的量的氯气,先氧化亚铁离子,由电子守恒可知溴离子一半被氧化,其离子反应为2Fe
2++2Br
-+2Cl
2=2Fe
3++Br
2+4Cl
-,
故答案为:2Fe
2++2Br
-+2Cl
2=2Fe
3++Br
2+4Cl
-;
(4)将四氧化三铁溶于过量的稀硝酸,发生离子反应为3Fe
3O
4+28H
++NO
3-=9Fe
3++NO↑+14H
2O,
故答案为:3Fe
3O
4+28H
++NO
3-=9Fe
3++NO↑+14H
2O;
(5)乙醇被硫酸酸化的重铬酸钾溶液氧化成乙酸,重铬酸钾被还原为硫酸铬,该氧化还原反应为2K
2Cr
2O
7+3C
2H
5OH+8H
2SO
4=2Cr
2(SO
4)
3+3CH
3COOH+2K
2SO
4+11H
2O,
故答案为:2K
2Cr
2O
7+3C
2H
5OH+8H
2SO
4=2Cr
2(SO
4)
3+3CH
3COOH+2K
2SO
4+11H
2O;
(6)S+NaOH=Na
2S
x+Na
2S
2O
3+H
2O中,S元素的化合价由0降低为负价,由0升高为+2价,2molS作还原剂时转移的电子数为4e
-,该反应为(2x+2)S+6NaOH=2Na
2Sx+Na
2S
2O
3+3H
2O,
其电子转移的方向和数目为
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/622762d0f703918fdf74a47b523d269758eec4de?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
,故答案为:
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/622762d0f703918fdf74a47b523d269758eec4de?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
.