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【单选题】
用NaAc·3H2O晶体,2.0mol/LHAc来配制pH为5.0的 HAc-NaAc缓冲溶液1L,其正确的配制是()。M(NaAc·3H2O)=136.0g/mol,Ka=1.8×10-5.
A.
将49gNaAc·3H2O放入少量水中溶解,再加入50mL2.0 mol/L HAc溶液,用水稀释1L
B.
将98 gNaAc·3H2O放少量水中溶解,再加人50mL 2.0mol/LHAc溶液,用水稀释至1L
C.
将25 gNaAc·3H2O放少量水中溶解,再加入100mL 2.0 mol/L HAc溶液,用水稀释至1L
D.
将49 gNaAc·3H2O放少量水中溶解,再加入100mL2.0mol/LHAc溶液,用水稀释至1L
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【简答题】33 Like many other Gulfport families, the Koshaks quickly began reorganizing their lives, John divided his family in the homes of two friends. The neighbor with her two children went to a refugee cent...
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【单选题】______ the storm, the ship would have reached its destination on time.
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【单选题】INTERTROPICAL CONVERGENCE ZONE OVER SOUTH PHILIPPINE PASSING OVER MINDANAO NORTHERN SULU AND PALAWAN. This paragraph is likely to be under the heading of .
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