以1L 0.1molL-1 的硫酸溶液 与 1L 0.4molL-1 的氨水溶液反应，反应后溶液的PH值是多少 （1）已知含11.2g KOH的稀溶液与1L0.1mol?L...

\u5c060.5L 0.1mol?L-1Fe2\uff08SO4\uff093\u6eb6\u6db2\u4e0e1L0.6mol?L-1\u6c28\u6c34\u6eb6\u6db2\u5b8c\u5168\u6df7\u5408\u5e76\u8fc7\u6ee4\uff0c\u6eb6\u6db2\u603b\u4f53\u79ef\u4e0d\u53d8\uff0c\u5219\u6240\u5f97\u6eb6\u6db2\u7684

\u4e24\u6eb6\u6db2\u6df7\u5408\u540e\uff0c\u53d1\u751f\u53cd\u5e94Fe3++3NH3?H2O=Fe\uff08OH\uff093\u2193+3NH4+\uff0c0.5L 0.1mol?L-1Fe2\uff08SO4\uff093\u6eb6\u6db2\u4e2dn\uff08Fe3+\uff09=2\u00d70.5L\u00d70.1mol?L-1=0.1mol\uff0c1L0.6mol?L-1\u6c28\u6c34\u4e2dn\uff08NH3\uff09=1L\u00d70.6mol?L-1=0.6mol\uff0c\u7531\u65b9\u7a0b\u5f0f\u53ef\u77e5\uff0c0.1molFe3+\u5b8c\u5168\u53cd\u5e94\uff0c\u6d88\u80170.3molNH3\uff0c\u5269\u4f590.3molNH3\uff0c\u53cd\u5e94\u540e\u6eb6\u6db2\u4e3a\u6c28\u6c34\u3001\u786b\u9178\u94f5\u7684\u6df7\u5408\u6eb6\u6db2\uff0c\u6c28\u6c34\u7684\u6d53\u5ea6\u4e3a0.3mol1.5L=0.2mol/L\uff0c\u786b\u9178\u94f5\u6291\u5236\u6c28\u6c34\u7684\u7535\u79bb\uff0c\u6545\u6df7\u5408\u6eb6\u6db2\u7684pH\u503c\u5c0f\u4e8e0.2mol?L-1\u6c28\u6c34\u6eb6\u6db2\u7684pH\u503c\uff0c\u6545\u9009D\uff0e

\uff081\uff09n\uff08KOH\uff09=11.2g56g/mol=0.2mol\uff0cn\uff08H2SO4\uff09=1L\u00d70.1mol/L=0.1mol\uff0c\u4e8c\u8005\u6070\u597d\u53cd\u5e94\u751f\u62100.2mol\u6c34\uff0c\u653e\u51fa11.46KJ\u7684\u70ed\u91cf\uff0c\u5219\u751f\u62101mol\u6c34\u65f6\u653e\u51fa\u7684\u70ed\u91cf\u4e3a10.2\u00d711.26kJ=56.3kJ\uff0c\u6240\u4ee5\u8868\u793a\u4e2d\u548c\u70ed\u7684\u70ed\u5316\u5b66\u65b9\u7a0b\u5f0f\u4e3a KOH\uff08aq\uff09+12H2SO4\uff08aq\uff09=12K2SO4\uff08aq\uff09+H2O\u25b3H=-56.3kJ/mol\uff0c\u6545\u7b54\u6848\u4e3a\uff1aKOH\uff08aq\uff09+12H2SO4\uff08aq\uff09=12K2SO4\uff08aq\uff09+H2O\u25b3H=-56.3kJ/mol\uff1b\uff082\uff09\u7269\u8d28\u7684\u805a\u96c6\u72b6\u6001\u4e0d\u540c\uff0c\u653e\u51fa\u7684\u70ed\u91cf\u4e0d\u540c\uff0c\u6c34\u84b8\u6c14\u6db2\u5316\u65f6\u653e\u70ed\uff0c\u5219\u6709|\u25b3H1|\uff1c|\u25b3H2|\uff0c\u7531\u4e8e\u6c22\u6c14\u7684\u71c3\u70e7\u4e3a\u653e\u70ed\u53cd\u5e94\uff0c\u25b3H\uff1c0\uff0c\u5219\u25b3H1\uff1e\u25b3H2\uff0c\u6545\u7b54\u6848\u4e3a\uff1a\u25b3H1\uff1e\u25b3H2\uff0e

混合后，
[NH4+]=0.1mol/L,[NH3.H2O]=0.1mol/L
∴Kb=1.77X10^-5=[OH-]
∴pH=14+lg[1.77X10^-5]≈9.25

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