某CuSO4、Fe2（SO4）3、H2SO4的混合溶液100mL，已知溶液中阳离_爱下问搜题

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问题选择题

某CuSO₄、Fe₂（SO₄）₃、H₂SO₄的混合溶液100mL，已知溶液中阳离子的浓度相同（不考虑水解），且SO₄^2-的物质的量浓度为6mol•L^-1，则此溶液最多溶解铁粉的质量为（　　）

A．5.6g

B．11.2g

C．22.4g

D．33.6g

答案

n（SO₄^2-）=0.1L×6mol•L^-1=0.6mol，CuSO₄、Fe₂（SO₄）₃、H₂SO₄的溶液中阳离子的浓度相同，则有n（Cu²⁺）=n（H⁺）=n（Fe³⁺），

由于溶液中阳离子的浓度相同，所以阳离子物质的量也相同，设Cu²⁺、Fe³⁺、H⁺三种离子物质的量均为n，

根据电荷守恒知道：2n+3n+n=0.6mol×2，由此解得n=0.2mol，

Cu²⁺、H⁺、Fe³⁺都能与Fe反应生成Fe²⁺，最后溶液的成分为FeSO₄，则n（FeSO₄）=0.6mol，

根据Fe的守恒可知，此溶液最多溶解铁粉的物质的量为0.6mol-0.2mol=0.4mol，

则此溶液最多溶解铁粉的质量为0.4mol×56g/moL=22.4g，

故选C．

单项选择题

下列除哪项外均可割取地上部分入药

A．烯莶草

B．灯心草

C．泽兰

D．龙胆草

E．益母草

阅读理解

　 Great Britain is traditionally made up of three parts: England in the south, Scotland in north and Wales in the southwest.

　　England is the largest and most developed of all the three. Its area, about 130,000 square kilometers, takes up nearly 60% of the whole island. Its population is mere than 46 million which makes up 85% of the country's whole population. The importance of England is so great in Britain that some foreigners just say “England” when they mean Britain. The same is true of the custom of speaking of the British people as the English who are the majority in the United Kingdom.

　　Scotland is the second largest both in area and population. It has an area of about 78,760 square kilometers, less than 30 % of the whole is land, with a population of 5 million, less than one-tenth of the total population.

　 Wales is the smallest of the three both in area and population. Its area, 20,700 square kilometers, makes up less than 9 % while its population, 2.7 million, does not exceed 5 % of the whole.

1. Which of the following maps shows the right position of England, Scotland and Wales? (E=" England" S=" Scotland" W = Wales)

2. If figure （图形） one below shows the area(面积) of Scotland, which picture in Figure two represents the area of Great Britain?

( Figure 1 )　　　　　　　　　　 Figure2:

3. If Figure one below shows the population of the island, which picture in Figure two shows the population of Wales?