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【单选题】
10 mol/LNa2S溶液的pH为( )。(H2S的Ka1,Ka2分别为1.3×10-7,7.1×10-15)A.
4.5
B.
1.03
C.
9.5
D.
12.97
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【单选题】安全教育——钢直尺的刻线间距为1mm,而刻线本身的宽度就有0.1~0.2mm,所以测量时读数误差比较大,只能读出毫米数,即它的最小读数值为( )mm。
A.
0.5mm
B.
1mm
C.
2mm
D.
0.1mm
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