用0.1mol/L的盐酸滴定0.1mol/L的NAOH溶液20mL.(1)需要盐酸多少mL?(2)若多滴1/20mL盐酸,问C(NAOH)=?PH=?(3)若少滴1/20mL盐酸,问C(NAOH)=?PH=?
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![用0.1mol/L的盐酸滴定0.1mol/L的NAOH溶液20mL.(1)需要盐酸多少mL?(2)若多滴1/20mL盐酸,问C(NAOH)=?PH=?(3)若少滴1/20mL盐酸,问C(NAOH)=?PH=?](/uploads/image/z/1280385-9-5.jpg?t=%E7%94%A80.1mol%2FL%E7%9A%84%E7%9B%90%E9%85%B8%E6%BB%B4%E5%AE%9A0.1mol%2FL%E7%9A%84NAOH%E6%BA%B6%E6%B6%B220mL.%281%29%E9%9C%80%E8%A6%81%E7%9B%90%E9%85%B8%E5%A4%9A%E5%B0%91mL%3F%EF%BC%882%EF%BC%89%E8%8B%A5%E5%A4%9A%E6%BB%B41%2F20mL%E7%9B%90%E9%85%B8%2C%E9%97%AEC%EF%BC%88NAOH%EF%BC%89%3D%3FPH%3D%3F%EF%BC%883%EF%BC%89%E8%8B%A5%E5%B0%91%E6%BB%B41%2F20mL%E7%9B%90%E9%85%B8%2C%E9%97%AEC%EF%BC%88NAOH%EF%BC%89%3D%3FPH%3D%3F)
用0.1mol/L的盐酸滴定0.1mol/L的NAOH溶液20mL.(1)需要盐酸多少mL?(2)若多滴1/20mL盐酸,问C(NAOH)=?PH=?(3)若少滴1/20mL盐酸,问C(NAOH)=?PH=?
用0.1mol/L的盐酸滴定0.1mol/L的NAOH溶液20mL.
(1)需要盐酸多少mL?
(2)若多滴1/20mL盐酸,问C(NAOH)=?PH=?
(3)若少滴1/20mL盐酸,问C(NAOH)=?PH=?
用0.1mol/L的盐酸滴定0.1mol/L的NAOH溶液20mL.(1)需要盐酸多少mL?(2)若多滴1/20mL盐酸,问C(NAOH)=?PH=?(3)若少滴1/20mL盐酸,问C(NAOH)=?PH=?
HCl+NaOH=NaCl+H2O,根据化学反应方程式知物质的量相等所以c1v1=c2v2,又c1=c2所以v1=v2=20ml,20ml恰好反应为中性的氯化钠溶液,多滴了溶液显酸性,C(NAOH)=0,PH=-lgc(H+),而体积变化了所以n(HCl)=0.1mol/Lx1/20ml/1000ml/L,c(HCl)=n/(40+1/20)ml/1000ml/L=2x10^-5x1000x20/801=5x10^-4mol/L,所以PH=-lgc(H+)约=3.3,同理第三问n(NaOH)=0.1mol/Lx1/20ml/1000ml/L,c(NaOH)=n/(40-1/20)ml/1000ml/L=2x10^-5x1000x20/799=5x10^-4mol/L=5x10^-4mol/L,kw=c(H+)c(OH-)=10^-14,PH=-lgc(H+)=14-3.3=10.7