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【简答题】
称取铝盐试样1.250 g,溶解后加0.0500 EDTA溶液25.00 mL,在适当条件下反应后,调节溶液pH=5~6,以二甲酚橙为指示剂,用0.02000 标准溶液回滴过量的EDTA,消耗 标准溶液21.50 mL,计算铝盐中铝的质量分数。
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【简答题】C It was at least tow months before Christmas, when nine-year-old Almie Rose told her father and me that she wanted a new bike. Her Barbi bike was just too old, and it needed repairing as well. As Chr...
【简答题】欲配制pH＝5．0的柠檬酸(H3Cit)缓冲溶液1000mL，问应取浓度均为0．50mol／L的H3Cit和NaOH溶液各多少毫升?要求将0．10mol／L HCl溶液1．0 L加入到10mL此缓冲溶液中，溶液的pH＝4．7，已知H3Cit的pKa1＝3．13，pKa2＝4．76，pKa3＝6．40。
【单选题】CIt is desirable to have screens on the vents of potable water tanks to ______．
A.
Filter the incoming air
B.
Prevent explosions
C.
Prevent backups
D.
Stop insects from entering
【单选题】“提运单号”栏：
A.
11/LJA-SRD/INV/II/2010
B.
POBUSUBl00207096
C.
10YYT—B018f12)
D.
BAN7239522GP
【简答题】Carl studied in our middle school three years ago. Last August his father found a job in another city and his family moved there. He began to study in the new school and we often write to each other. ...
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