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TCAS RA P: Hongkong Centre,Pacific 193 1C:Pacific193,HongkongCentre,”traffic,traffic,traffic,taffic”P:Center,Pacific193,we have indications of 2that appears to be3 towards us , can you confirm that traffic’s intended level and that it’s notin 4with usC: Pacific193, 5 .”Climb climb climb”P: pacific 193, 6C:Pacific193,roger.” clear of conflict,clear of conflict”P:Pacifid193,7 .C: pacific193,roger.P: Pacific 1938 , 9 .C: Pacific 193, roger, 10P: Pacific 193, maintaining FL310.

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某缓冲溶液的共轭碱Ka=1.0×10-7,从理论上推算该缓冲溶液的缓冲范围是( )。

A. 8~10
B. 5~6
C. 4~7
D. 6~8
E. 9~11

人体血浆中的最重要的抗酸成分是( )。

A. CO2(溶解)
B. HCO3-
CO32-
D. H3PO4
E. PO43-

用H3PO4(pKa1=2.12,pKa2=7.21, pKa2=12.67和NaOH来配制pH=7.0的缓冲溶液,此缓冲溶液的抗酸成分是( )。

A. H2PO4-
B. HPO42-
C. PO43-
D. OH-
E. H+

0.10mol/L NH3溶液(Kb=1.79×10-5)40.0mL与0.10mol/L的HCl20.0mL混合,此时溶液的pH为( )。

A. 8.1
B. 2.87
C. 4.75
D. 9.25
E. 10.35

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