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【单选题】
氢氟酸HF是一元弱酸,是由硫酸和矿物质氟化钙反应生成的,研究HF稀溶液对其他矿物质的影响,制备了0.010 mol/L的HF水溶液,计算在常温下该溶液的pH =( )。(HF的Ka = 6.8 10 )
A.
2.58
B.
2.29
C.
2.
D.
2.82
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【单选题】A subject which seems to have been insufficiently studied by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind. Them seems no doub...
A.
focus on some unknown aspects
B.
be pursued on a larger scale
C.
go much deeper
D.
be carried out within a larger scope