题目内容

下列各缓冲缓冲容量最大的是溶液( )

A. 500mL中含有0.15mol HAc和0.05mol NaAc
B. 500mL中含有0.05mol HAc和0.15mol NaAc
C. 500mL中含有0.1mol HAc和0.1mol NaAc
D. 1000mL中含有0.1mol HAc和0.1mol NaAc

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配制pH=9.30的缓冲溶液,下列缓冲对中最合适的是( )

A. NaHCO3-Na2CO3(H2CO3的pKa2 = 10.33)
B. HAc - NaAc(HAc的pKa = 4.756)
C. NH4Cl – NH3·H2O(NH3·H2O的pKb = 4.75)
D. Na2HPO4 – Na3PO4(H3PO4的pKa3 = 12.32)

人体血液的pH值总是维持在7.35〜7.45这一狭小的范围内。其中主要原因是由于( )

A. 血液中的HCO3-和H2CO3只允许维持在一定的比率范围内
B. 人体内有大量的水分(约占体重的70%)
C. 排出的CO2气体一部分溶在血液中
D. 排出的酸性物质和碱性物质溶在血液中

某缓冲溶液的共轭碱的Kb=1.0×10-6,从理论上推算该缓冲溶液的缓冲范围是( )

A. 6~8
B. 7~9
C. 5~7
D. 5~6

Task 4Rewrite the following sentences after the models.Model 1:You are not concentrating on which fork you shoulduse.You are not concentrating on which forkto use.1. He did not know where he should go.2. We have not decided whether we should go there or not.3. I can tell you how you can get to the cinema.

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