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保护水资源、合理利用废水、节省水资源、加强废水的回收利用已被越来越多的人所关注。已知:某无色废水中可能含有H + 、NH 4 + 、CO 3 2- 、 NO 3 - 、SO 4 2- 、Fe 3 + 、Al 3 + 、Mg 2 + 、Na + 中的几种,为分析其成分,分别取废水样品1 L,进行了三组实验,其操作和有关图像如下所示: 请回答下列问题: (1)根据上述3组实验可以分析废水中一定不存在的阴离子是____________,一定存在的阳离子是____________。 (2)写出实验3图像中沉淀达到最大量且质量不再发生变化阶段发生反应的离子方程式:____________________________________________________。 (3)分析图像,在原溶液中 c (NH 4 + )与 c (Al 3 + )的比值为________,所得沉淀的最大质量是__________g。 (4)若通过实验确定原废水中 c (Na + )=0.18 mol·L -1 ,试判断原废水中NO 3 - 是否存在?________(填“存在”“不存在”或“不确定”)。若存在, c (NO 3 - )=________mol·L -1 。(若不存在或不确定则此空不填)
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举一反三
【单选题】汽车保险中的基本险分为车辆损失险、 、盗抢险和车上人员责任险。
A.
商业险
B.
附加险
C.
自燃险
D.
第三者责任险
查看完整题目与答案
【判断题】凝结时间、安定性试验用水应是洁净的饮用水,如有争议时应以蒸馏水为准。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Equipped with modern science and technology people of today feel many assertions which were once taken as______truth absurd.
A.
religious
B.
profound
C.
sacred
D.
prominent
查看完整题目与答案
【单选题】All the following can be inferred from the passage EXCEPT______.
A.
more and more people were leaving the farm to take up nonagricultural jobs
B.
there was a significant change of meaning in the world family
C.
people no longer wanted to get married
D.
the rapid economic growth lasted for more than half a century
查看完整题目与答案
【单选题】Which of the following behaviors is not what the Hewlett-Packard did to the people who were not performing up to par?
A.
The Hewlett-Packard will let them depart immediately.
B.
The Hewlett-Packard may coach them to better performance.
C.
The Hewlett-Packard may put them in a job that is more suited to the people's skills.
查看完整题目与答案
【单选题】At the bus stop ______ a soldier and two young people on their way to North Carolina.
A.
were
B.
was
C.
is
D.
sits and waits
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【判断题】遵义会议是中国共产党历史上的一个生死攸关的转折点。
A.
正确
B.
错误
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【简答题】驾驶机动车在高速公路上发生故障，需要停车排除故障时，若能将机动车移至应急车道内，则不需要开启危险报警闪光灯。
查看完整题目与答案
【单选题】As a grassroots singer, she reads everything she can concerning music, and takes every opportunity to improve herself.
A.
catch sight of
B.
get hold of
C.
take charge of
D.
make mention of
查看完整题目与答案
【单选题】Thouands of Irish people starved during the 'Porto Famine' because.
A.
they were so dependent on potatoes that they refused to eat anything else.
B.
they were forced to leave their homeland and move to America.
C.
the weather conditions in Ireland were not suitable for growing potatoes.
D.
the potato harvest was bad.
查看完整题目与答案
相关题目：
【单选题】汽车保险中的基本险分为车辆损失险、 、盗抢险和车上人员责任险。
A.
商业险
B.
附加险
C.
自燃险
D.
第三者责任险
查看完整题目与答案
【判断题】凝结时间、安定性试验用水应是洁净的饮用水,如有争议时应以蒸馏水为准。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Equipped with modern science and technology people of today feel many assertions which were once taken as______truth absurd.
A.
religious
B.
profound
C.
sacred
D.
prominent
查看完整题目与答案
【单选题】All the following can be inferred from the passage EXCEPT______.
A.
more and more people were leaving the farm to take up nonagricultural jobs
B.
there was a significant change of meaning in the world family
C.
people no longer wanted to get married
D.
the rapid economic growth lasted for more than half a century
查看完整题目与答案
【单选题】Which of the following behaviors is not what the Hewlett-Packard did to the people who were not performing up to par?
A.
The Hewlett-Packard will let them depart immediately.
B.
The Hewlett-Packard may coach them to better performance.
C.
The Hewlett-Packard may put them in a job that is more suited to the people's skills.
查看完整题目与答案
【单选题】At the bus stop ______ a soldier and two young people on their way to North Carolina.
A.
were
B.
was
C.
is
D.
sits and waits
查看完整题目与答案
【判断题】遵义会议是中国共产党历史上的一个生死攸关的转折点。
A.
正确
B.
错误
查看完整题目与答案
【简答题】驾驶机动车在高速公路上发生故障，需要停车排除故障时，若能将机动车移至应急车道内，则不需要开启危险报警闪光灯。
查看完整题目与答案
【单选题】As a grassroots singer, she reads everything she can concerning music, and takes every opportunity to improve herself.
A.
catch sight of
B.
get hold of
C.
take charge of
D.
make mention of
查看完整题目与答案
【单选题】Thouands of Irish people starved during the 'Porto Famine' because.
A.
they were so dependent on potatoes that they refused to eat anything else.
B.
they were forced to leave their homeland and move to America.
C.
the weather conditions in Ireland were not suitable for growing potatoes.
D.
the potato harvest was bad.
查看完整题目与答案
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