第三章单元测试
- Which one is not the requirement for the reactions suitable for direct titrations? （ ）
- Which indicator is used when titrating HCl with NaOH ? （ ）
- The methods to improve titrimetric analysis accuracy are… （ ）
- Which of the followings are needed when preparing 500 mL of 0.1 mol/L HCl solution? （ ）
- The indicators for acid-base titrations are organic dyes, which change color with the concentration. （ ）
A:take place quickly B:there are side reactions C:take place essentially to completion D:there are no side reactions
答案:there are side reactions
A:Methyl Red B:Phenolphthalein C:Methyl Orange D:Xylenol orange(二甲酚橙)
A:increase the titration times B:decrease the titration times C:increase the amount of reagents D:decrease the amount of reagents
A:volumetric flask(容量瓶) B:graduated cylinder(量筒) C:pipette(移液管) D:reagent bottle
A:对 B:错
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