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【简答题】
磷酸（H 3 PO 4 ）在溶液中能够以H 3 PO 4 、H 2 PO 4 - 、HPO 4 2- 、和PO 4 3- 四种粒子形式存在，当溶液的pH发生变化时，其中粒子的物质的量占四种粒子总物质的量的分数δ也可能发生变化．下图是H 3 PO 4 溶液中，各种粒子的物质的量分数δ随pH的变化曲线： （1）设磷酸总浓度为c（总），写出c（总）与各粒子浓度间的关系式______． （2）向Na 3 PO 4 溶液中逐滴滴入稀盐酸，当pH从9降到6的过程中发生的主要反应的离子方程式为______．当pH=7时，溶液中主要存在的阴离子（OH - 离子除外）是______． （3）从图中推断NaH 2 PO 4 溶液呈______性（填“酸”、“碱”、或“中”），其原因是______． （4）在Na 3 PO 4 溶液中，c（Na + ）/c（PO 4 3- ）______3（填“＞”、“═”、或“＜”）；向该溶液中滴入几滴浓KOH溶液后，c（Na + ）/c（PO 4 3- ）的值减小，原因是______．
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举一反三
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A.
vigorous
B.
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C.
sharp
D.
busy
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A.
1∶1∶1
B.
1∶1∶2
C.
1∶2∶4
D.
1∶4∶4
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A.
As soon as
B.
As far as
C.
As though
D.
Now that
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A.
hobby
B.
habit
C.
interest
D.
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【简答题】n. 商店,贮藏; vt. 储存,贮藏
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A.
like to encounter
B.
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C.
are likely to encounter
D.
are like to encounter
【简答题】什么叫安时特性
【单选题】This is a huge and difficult project and if you take it up, you ________ many difficulties.
A.
like to encounter
B.
like to encountering
C.
are likely to encounter
D.
are like to encounter
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