题目内容

0.010mol·L-1Na2SO4溶液与0.20mol·L-1KNO3等体积混合后,溶液的离子强度是( )。

A. 0.115
B. 0.23
C. 0.345
D. 0.103
E. 0.045

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c(HA)=0.050mol·L-1的溶液的pH=5.35,则HA的Ka等于( )。

A. 2.0×10-11
B. 4.0×10-10
C. 4.5×10-6
D. 8.9×10-5
E. 5.0×10-2

已知Mg(OH)2的Ksp=5.61×10—12,Mg(OH)2溶解度为( )。

A. 1.12×10-4mol·L-1
B. 1.50×10-4mol·L-1
C. 1.20×10-6mol·L-1
D. 2.05×10-4mol·L-1
E. 3.46×10-4mol·L-1

有一难溶强电解质M3X2，其溶解度为( )。

A. Ksp
B. [Ksp]1/3
C. [Ksp]1/5
D. [(Ksp/22×33)] 1/5
E. [(Ksp/23×32)] 1/5

听力题，播放录音，完成以下两道听力题。Task 1 Match the patients with their illnesses.1 Dick a. stomach upset2 Leo b. gum disease3 Borg c. insomnia4 Wood d. allergy5 Davif e. earacheTask 2 Decide the statements True or False according to the long conversation.1 The patient is aware of the place for the admission procedures.2 The patient occupies a single room ward.3 The patient should bring daily articles by himself.4 The patient just presses the button if the nurse is needed.5 During the visiting hours only one visitor can be allowed each time to come into the ward.