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ujqt007

金虫 (正式写手)

[求助] 求助 这道化学题怎么做

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zhrmghgmn

金虫 (正式写手)

【答案】应助回帖

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soundhorizo(金币+2): 感谢应助,欢迎常来分析版指导交流 ^^ 2012-03-05 10:09:58
ujqt007(金币+10): 2012-03-06 15:10:17
写反了,更正如下:(不好意思)
设NaH2PO4的浓度为c1,Na2HPO4的浓度为c2
25×c2=0.1×28
c2=0.112mol/L
7.75=PKa2+logc2/c1=7.20+log c2/c1
log c2/c1=0.55
c2/c1=3.548
c1=c2/3.548=0.0316mol/L
3楼2012-03-05 08:37:08
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zhrmghgmn

金虫 (正式写手)

【答案】应助回帖

感谢参与,应助指数 +1
设NaH2PO4的浓度为c1,Na2HPO4的浓度为c2
25×c1=0.1×28
c1=0.112mol/L
7.75=PKa2+logc2/c1=7.20+log c2/c1
log c2/c1=0.55
c2/c1=3.548
c2=3.548×0.112=0.397mol/L
2楼2012-03-05 08:30:49
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ujqt007

金虫 (正式写手)

引用回帖:
3楼: Originally posted by zhrmghgmn at 2012-03-05 08:37:08:
写反了,更正如下:(不好意思)
设NaH2PO4的浓度为c1,Na2HPO4的浓度为c2
25×c2=0.1×28
c2=0.112mol/L
7.75=PKa2+logc2/c1=7.20+log c2/c1
log c2/c1=0.55
c2/c1=3.548
c1=c2/3.548=0.0316mol/L




5楼2012-03-06 15:18:22
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