问题 实验题

用酸式滴定管准确移取25.00mL某未知浓度的盐酸溶液于一洁净的锥形瓶中,然后用0.2000mol·L-1的氢氧化钠溶液(指示剂为酚酞)滴定得结果如下

(1)达到滴定终点的时溶液颜色的变化为______色到_______色;    

(2)根据以上数据可以计算出盐酸的物质的量浓度为_____________;  

(3)以下操作造成测定结果偏高的原因可能是_____________。   

A、 滴定终点读数时,俯视滴定管的刻度,其它操作均正确     

B、 盛装未知液的锥形瓶用蒸馏水洗过,未用待测液润洗

C、 滴定到终点读数时发现滴定管尖嘴处悬挂一滴溶液

D、 未用标准液润洗碱式滴定管

答案

(1)无;(浅)红    

(2)0.1448 mol/L  

(3)CD

单项选择题
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Channel Islands tourist guide

Friendly communities, a rough coastline and gentle, untouched scenery make the islands ideal for anyone who wants to ‘get out there’ and explore on foot or by bike.

England tourist guide

England is the largest country in Britain, and home to the largest city in Europe, 600 miles of beautiful coastline, and a population almost three times that of Australia.

Isle of Man tourist guide

A country rich in natural history, beautiful scenery and first-class historical sites with attractions for all age groups and interests.

London tourist guide

London needs little introduction. This lively, multi-cultural capital is a world leading destination city.London is full of history, heritage and culture, yet one of the most fast-moving, cosmopolitan(世界性的) cities on the planet.

Northern Ireland tourist guide

Exciting cities with shopping, nightlife and festivals, outdoor activities, wonderful food and untouched peaceful and private places where you can relax.

Scotland tourist guide

Scotland is everything you imagine – whisky, golf and wealth of castles and historic sites. The Highlands area is one of the last wildernesses in Europe.

Wales tourist guide

Wales is different from other parts of Britain and just 2 hours from Heathrow Airport. With 400 castles, yet only one official motorway, you have to take things at a gentle pace.

小题1:What is special about England?

A.It is the largest country in Europe.

B.It enjoys a beautiful coastline of 600 miles.

C.It is one of the last wildernesses in Europe.

D.It has a large population similar to Australia.小题2:If you want to visit castles, you are supposed to go to _______.

A.Channel Islands and Isle of Man

B.Isle of Man and London

C.Northern Ireland and Wales

D.Wales and Scotland小题3:The passage can be classified as           .

A.an advertisement

B.a geography article

C.a report

D.a diary