问题 选择题

25℃时,关于下列各溶液的叙述中,正确的是(  )

A.25℃时,将20 mL 0.1mol•L-1H2SO4溶液和30mL 0.15mol•L-1NaOH溶液混合,若混合后溶液体积不变,则混合溶液的pH为11

B.常温下,①pH=3的HCl溶液和pH=11的氨水等体积混合液 ②pH=3的HCl溶液 ③pH=11的氨水中由水电离出的c(H+):①>③>②

C.常温下,0.1 mol/L HA(某酸)溶液pH≠l,则BA(盐)溶液pH一定大于7

D.25℃时,pH相同的溶液①CH3COONa   ②C6H5ONa   ③NaHCO3中c(Na+):①>③>②

答案

A.n(H2SO4)=0.02L×0.1mol•L-1=0.002mol,n(H+)=0.004mol,n(OH-)=0.03L×0.15mol•L-1=0.0045mol,反应后碱过量,反应后的c(OH-)=

0.0045mol-0.004mol
0.05L
=0.01mol/L,则反应后的pH=12,故A错误;

B.pH=3的HCl溶液和pH=11的氨水等体积混合液,氨水为弱电解质的溶液,氨水过量,反应后c(OH-)<0.001mol/L,

②中c(H+)=0.001mol/L,③中c(OH-)=0.001mol/L,c(H+)或c(OH-)越大,水的电离程度越小,则由水电离出的c(H+):①>③=②,故B错误;

C.常温下,0.1 mol/L HA(某酸)溶液pH≠l,说明HA为弱酸,但BOH的碱性强弱不确定,所以反应后溶液的酸碱性不确定,故C错误;

D.已知酸性:CH3COOH>H2CO3>C6H5OH,酸性越弱,对应的盐水解程度越大,则pH相等时,浓度①>③>②,故D正确.

故选D.

阅读理解

Why do we like drinking water from plastic bottles? Some people think it is healthy and clean. Others drink bottled water because it’s easy — you can carry it around with you. In hot countries, like Greece, we often buy bottles of cold water in the summer.

However, making lots of plastic is not a good idea for many reasons. First of all, we need a lot of oil for plastic products. We usually use oil as a source(资源) of energy. If we reduced the number of bottles we made, we wouldn’t need so much oil. Plastic bottles also pollute the environment. If we recycled all our plastic bottles, we wouldn’t need so much space for rubbish dumps. But in Greece, we don’t recycle much of the plastic we use. In 2006, Greeks recycled only about 10% of plastic waste. The rest became rubbish on land and in rivers and sees. So next time you want to throw away a plastic bottle in the litter bin, stop and think. If you recycled it, you would help the environment. But what can you do when there isn’t a recycling bin near you? Well, there are loes of useful ways that you can use your bottles again. For example, an empty bottle makes a great piggy bank for your pocket money, and if you cut a bottle in half, you will have a plant pot. Go green! You can make a difference.

小题1:What is not mentioned about bottled water in this passage?

A.It’s healthy.

B.It’s clean.

C.It’s easy.

D.It’s expensive.小题2:Plastic products are made from         .

A.energy

B.oil

C.rubbish

D.plants小题3:        of plastic waste became rubbish in Greece in 2006.

A.10%

B.50%

C.80%

D.90%小题4: Which is the best way to deal with used plastic bottles?

A.To recycle them.

B.To make a piggy bank.

C.To make a plant pot.

D.To drop them into the river.小题5: The underlined part in this passage tells us “       ”.

A.To make a different life, you’d better go outside.

B.To look different, you’d better wear green clothes.

C.To protect the environment, you can do something.

D.To go green, you should use plastic products.

单项选择题