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搜题
【简答题】
Mr. Ullman was the 9)___________ investigator for the new study. He is a professor of neuroscience at Georgetown University Medical Center in Washington. He says he was surprised to find that combining the two methods might not help the brain in 10)___________ the new language.
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【单选题】3-2、0.10Mol/L N a 2 C O 3 水溶液的PH值为( ),已知Ka2=5.6× 1 0 − 1 1 ,Ka1=4.2× 1 0 − 7 。
A.
7.47
B.
11.63
C.
4.15
D.
9.46
【单选题】3-2、某三元酸 H 3 A 的pKa1 = 3.96、pKa2 = 6.00、pKa3 = 10.02,则 0.10 mol/L N a 3 A 溶液的pH是 ( )
A.
8.01
B.
10.02
C.
11.51
D.
12.51