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计算下列溶液中H3O＋和Ac－的浓度：

大学 2021-02-04 15:20:47 溶液,浓度已帮助人

计算下列溶液中H₃O⁺和Ac^-的浓度：

热搜：标准溶液是一种已知浓度的溶液

答案解析

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$latex.action?latex=YyhIXzNPXispPWMoQWNeLSk9XHNxcnR7S197YX1ee1xvbWludXMgfVxjZG90IChjL2NeXG9taW51%0D%0AcyApfWNeXG9taW51cyA9XHNxcnR7MS43NVx0aW1lczEwXnstNX1cY2RvdCAwLjA1MCB9Y15cb21p%0D%0AbnVzPTkuMzVcdGltZXMxMF57LTR9bW9sXGNkb3QgZG1eey0zfQ%3D%3D$ $对于缓冲溶液HAc-KAc：
$latex.action?latex=YyhIXispPUtfe2F9Xntcb21pbnVzIH0oSEFjKVxmcmFje2Nee2VxfShIQWMpfXtjXntlcX0oQWNe%0D%0ALSl9Y15cb21pbnVzID0xLjc1XHRpbWVzMTBeey01fVxjZG90IFxmcmFjezAuMDUwfXswLjAyNTB9%0D%0AY15cb21pbnVzIA%3D%3D$
=3.5×10-5mol·dm-3
c(Ac-)≈0.025mol·dm-3$
$latex.action?latex=IEtfe2F9Xntcb21pbnVzfShIQWMpPVxmcmFje2MoSF4rKX17Y157ZXF9KEhBYyl9PVxmcmFjeygw%0D%0ALjAyNSt4KVxjZG90IHh9ezAuMDUwLXh9XGFwcHJveCBcZnJhY3swLjAyNVxjZG90IHh9ezAuMDUw%0D%0AfT0xLjc1XHRpbWVzMTBeey01fQ%3D%3D$
x=c(Ac-)/(mol·dm-3)=3.5×10-5
c(H+)≈0.025mol·dm-3$忽略水的解离，当0.050mol·dm-3NaOH溶液与0.050mol·dm-3HAc溶液完全中和后，溶液中存在HAc-NaAc的缓冲溶液：
$latex.action?latex=YyhIXispPUtfe2F9Xntcb21pbnVzIH0oSEFjKVxmcmFje2Nee2VxfShIQWMpfXtjXntlcX0oQWNe%0D%0ALSl9Y15cb21pbnVzID0xLjc1XHRpbWVzMTBeey01fVxjZG90IFxmcmFjezAuMDI1MH17MC4wMjUw%0D%0AfWNeXG9taW51cyA%3D$
=1.75×10-5mol·dm-3
c(Ac-)≈0.025mol·dm-3