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?????h2c2o4????????

????????h2c2o4?????

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??naoh???????????????????

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h2c2o4???????ka1=5.9�10-2?ka2=6.4�10-5????????cka1?10-8?cka2?10-8?ka1/ka2?105??????????????????h+? h2c2o4+2naoh===na2c2o4+2h2o

???ph?8.4????????????

naoh?????????????????????????

-cook

-cooh

+naoh===

-cook

-coona

+h2o

??????ph?9.1??????????????

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??naoh??????????

???????naoh1g?100ml?????50ml?????????????500ml???????200ml???????

????0.4~0.5g??????????????250ml??????20~30ml????????1~2?0.2%???????naoh?????????????????????????

??h2c2o4????

????0.5g???????????????20ml?????????????100ml??????????????????

?20ml?????????????????????1~2???naoh???????????????????????????????

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??naoh???????

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mkhc8h4o4 /g???

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vnaoh /ml???

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cnaoh /mol�l-1

naoh /mol�l-1

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cnaoh /mol�l-1

m? /g

v? /ml20.0020.0020.00

vnaoh /ml???

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2. ????????????????????

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1. ???

?9.0ml???100ml????????????????????19.0ml?????????????10ml95%???????????13.0g??????????2-3???? ????????

2. ????????

?????????????????????????5ml 40%nahso3?????????????????????????????????????????????????????????????????????????????????30????????????????????

????????????hbr?????????hbr??????????????????????????????

3. ?????

???????????????????????????????????????????????????????????????????????????????????????????????4ml????????????????????????????????????????30ml?????

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4. ??????

???????2-3??????????????????37-40????????????????????????????+??=30.3g,?????20.5g????9.8g?

5.?????

?????0.126�109=13.7g

???9.8/13.7=71.5%

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