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[主观题]
测定水的总硬度,吸取水样50.0ml,以铬黑T为指示剂,用0.0105mol/LEDTA-2Na标准溶液滴定,耗去4.05ml
,可得此样的总硬度为()(以CaCO3计,换算系数100.09)。
A.85.1mg/L
B.8.51mg/L
C.851.3mg/L
D.0.85mg/L
提问人:网友jjxwhb
发布时间:2022-01-06
A.85.1mg/L
B.8.51mg/L
C.851.3mg/L
D.0.85mg/L
A.3.00 mg/L
B.30.03mg/L
C.300.30 mg/L
D.0.30 mg/L
A.1.09g/mL
B.1.0193g/mL
C.1.02g/mL
D.1.0g/mL
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