4.欲配制pH值为9.0的缓冲溶液,下列酸及其共轭碱(共轭碱未写出)中最合适的是A.HCOOH [KaΘ(HCOOH)=1.77×10-4] B.HAc [KaΘ(HAc)=1.76×10-5]C.HF [KaΘ(HF)=3.53×10-4] D.NH4+ [KaΘ(NH4+)=5.65×10-10]
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![4.欲配制pH值为9.0的缓冲溶液,下列酸及其共轭碱(共轭碱未写出)中最合适的是A.HCOOH [KaΘ(HCOOH)=1.77×10-4] B.HAc [KaΘ(HAc)=1.76×10-5]C.HF [KaΘ(HF)=3.53×10-4] D.NH4+ [KaΘ(NH4+)=5.65×10-10]](/uploads/image/z/3394590-6-0.jpg?t=4.%E6%AC%B2%E9%85%8D%E5%88%B6pH%E5%80%BC%E4%B8%BA9.0%E7%9A%84%E7%BC%93%E5%86%B2%E6%BA%B6%E6%B6%B2%2C%E4%B8%8B%E5%88%97%E9%85%B8%E5%8F%8A%E5%85%B6%E5%85%B1%E8%BD%AD%E7%A2%B1%EF%BC%88%E5%85%B1%E8%BD%AD%E7%A2%B1%E6%9C%AA%E5%86%99%E5%87%BA%EF%BC%89%E4%B8%AD%E6%9C%80%E5%90%88%E9%80%82%E7%9A%84%E6%98%AFA.HCOOH+%5BKa%CE%98%28HCOOH%29%3D1.77%C3%9710-4%5D+B.HAc+%5BKa%CE%98%28HAc%29%3D1.76%C3%9710-5%5DC.HF+%5BKa%CE%98%28HF%29%3D3.53%C3%9710-4%5D+D.NH4%2B+%5BKa%CE%98%28NH4%2B%29%3D5.65%C3%9710-10%5D)
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