20春学期《分析化学》在线平时作业1

adminhan

<div>酸碱指示剂选择依据是（）</div>
A:<div>指示剂变色点与化学计量点相符合&nbsp;<span>&nbsp;&nbsp;</span></div>
B:<div>指示剂变色点在滴定突跃范围之内</div>
C:<div>指示剂变色范围在滴定突跃范围之内<span>&nbsp;&nbsp; </span></div>
D:<div>指示剂在pH=7.0时变色&nbsp;</div>
E:指示剂在pH=7.0&plusmn;1.0范围内变色

<div>已知 lg<em>K</em>(ZnY)=16.5和</div><table cellspacing="0" cellpadding="0" border="1"><tbody><tr><td valign="top" width="88"><div align="center">pH</div></td><td valign="top" width="51"><div align="center">4</div></td><td valign="top" width="51"><div align="center">5</div></td><td valign="top" width="51"><div align="center">6</div></td><td valign="top" width="51"><div align="center">7</div></td></tr><tr><td valign="top" width="88"><div align="center">lg<em><span>a</span></em>_Y(H)</div></td><td valign="top" width="51"><div align="center">8.44</div></td><td valign="top" width="51"><div align="center">6.45</div></td><td valign="top" width="51"><div align="center">4.65</div></td><td valign="top" width="51"><div align="center">3.32</div></td></tr></tbody></table><div>若用0.02 mol/L EDTA滴定0.02mol/L Zn²⁺溶液，能够准确滴定时最高允许酸度是（）</div>
A:<div>pH&asymp;4<span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></div>
B:pH&asymp;5<span>&nbsp;</span>
C:pH&asymp;6<span>&nbsp;&nbsp;&nbsp;&nbsp;</span>
D:pH&asymp;7

<div>测量溶液pH通常所使用的两支电极为（）</div>
A:<div>玻璃电极和饱和甘汞电极<span>&nbsp;&nbsp;</span></div>
B:玻璃电极和Ag-AgCl电极
C:玻璃电极和标准甘汞电极
D:饱和甘汞电极和Ag-AgCl电极

<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">物质</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman">B</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">的物质的量的浓度是指（）</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><o:p></o:p></span></p>
A:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">物质</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman">B</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">的质量除以混合物的体积</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><o:p></o:p></span></p>
B:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman">B</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）</span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">、物质</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman">B</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">的量除以混合物的体积</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; mso-hansi-font-family: 宋体"><o:p></o:p></span></p>
C:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">物质</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman">B</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">的摩尔质量除以混合物的体积</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><o:p></o:p></span></p>
D:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">物质</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman">B</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">的摩尔数除以混合物的体积</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><o:p></o:p></span></p>
E:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">物质</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman">B</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">的物质的量除以混合物的体积</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><o:p></o:p></span></p>

<div>在水溶液中，直接滴定弱酸或弱碱时，要求cK_a或cK_b（）</div>
A:<div>&ge;10^-6<span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;&nbsp;</span></div>
B:&nbsp;&le;10^-6&nbsp;<span>&nbsp;</span>
C:&nbsp;&ge;10^-8<span>&nbsp;&nbsp;&nbsp; </span>
D:&le; 10^-8<span>&nbsp;&nbsp; </span>
E:=10^-8

<div>用K₂Cr₂O₇标定Na₂S₂O₃，采用的滴定方式属于（）</div>
A:<div>直接滴定<span>&nbsp;&nbsp;&nbsp; </span></div>
B:返滴定<span>&nbsp;&nbsp;&nbsp; </span>
C:置换滴定<span>&nbsp;&nbsp;&nbsp; </span>
D:间接滴定

<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在重量分析中，被测组分不能完全沉淀下来，应该进行（）</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><o:p></o:p></span></p>
A:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman">A</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）、对照试验</span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman">&nbsp;<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="mso-spacerun: yes">&nbsp;&nbsp;</span></span></font></span></p>
B:<font size="3"><font face="Times New Roman">B</font><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）、空白试验</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;</span><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;</span></font></span></font>
C:<font size="3"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;</span>C</font><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）、仪器校准</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp; </span></font></span></font>
D:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman">D</font></span><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）、方法校正</span><span lang="EN-US" style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;</span><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></font></span></p>
E:<font size="3"><font face="Times New Roman">E</font><span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）、增加测定次数</span></font>

<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><span style="FONT-SIZE: 12pt; COLOR: black; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">某物质的摩尔吸光系数</span><em><span lang="EN-US" style="FONT-SIZE: 12pt; COLOR: black; LINE-HEIGHT: 150%; FONT-FAMILY: Symbol; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-char-type: symbol; mso-symbol-font-family: Symbol"><span style="mso-char-type: symbol; mso-symbol-font-family: Symbol">e</span></span></em><span style="FONT-SIZE: 12pt; COLOR: black; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">值很大，则表明（）</span><span lang="EN-US" style="FONT-SIZE: 12pt; COLOR: black; LINE-HEIGHT: 150%; mso-hansi-font-family: 宋体"><o:p></o:p></span></p>
A:<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><span style="FONT-SIZE: 12pt; COLOR: black; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">该物质的浓度很高</span><span lang="EN-US" style="FONT-SIZE: 12pt; COLOR: black; LINE-HEIGHT: 150%"><font face="Times New Roman"><span style="mso-spacerun: yes">&nbsp;&nbsp;</span><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;</span></font></span></p>
B:<span style="FONT-SIZE: 12pt; COLOR: black; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">该物质对某波长的光吸收能力很强</span>
C:<span style="FONT-SIZE: 12pt; COLOR: black; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">测定该物质的灵敏度很高</span>
D:<span style="FONT-SIZE: 12pt; COLOR: black; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'">测定该物质的准确度高</span>

<div>移取KHC₂O₄&middot;H₂C₂O₄溶液25.00 mL, 以0.1500 mol/L NaOH溶液滴定至终点时消耗25.00 mL。今移取上述KHC₂O₄&middot;H₂C₂O₄溶液20.00 mL, 酸化后用 0.0400mol/L KMnO₄溶液滴定至终点时消耗溶液体积(mL)是（）</div>
A:20.00<span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
B:25.00<span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
C:31.25<span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
D:40.00

<div>下列说法中，何者是错误的？（） </div>
A:<div>摩尔质量的单位是g/mol<span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></div>
B:<div>物质B的质量m_B就是通常说的用天平称取的质量&nbsp;</div>
C:<div>物质的量n与质量m的关系为：n=m/M，式中M为物质的量浓度&nbsp;</div>
D:<div>物质的量n与质量m的关系为：n=m/M，式中M为物质的摩尔质量</div>
E:物质的量浓度以符号c_B表示，常用单位为mol/L

<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">因为透射光（或反射光）和吸收光按一定比例混合而称白光，故称这两种光为互补光。</span>
A:错误
B:正确

<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">采用色谱归一化法定量的前提条件是试样中所有组分全部出峰。</span>
A:错误
B:正确

<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">具有不对称电位是膜电极的共同特性，不同类型膜电极的不对称电位的值不同，但所有同类型膜电极（如不同厂家生产的氟电极），不对称电位的值相同。</span>
A:错误
B:正确

<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">甘汞电极和</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">Ag-AgCl</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">电极只能作为参比电极使用。</span>
A:错误
B:正确

<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">配位滴定中最高的</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">pH</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">（或最低酸度）控制由酸效应决定。</span>
A:错误
B:正确

<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">速率理论给出了影响柱效的因素及提高柱效的途径。</span>
A:错误
B:正确

<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">配位滴定法准确测定单一金属离子的条件</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">lg(cK_MY</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">ˊ</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-hansi-font-family: 宋体; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">&ge;8</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">。</span>
A:错误
B:正确

<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">0.1009&times;1.314&times;(28.00</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">－</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">21.78)/0.3554</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">的结果应取四位有效数字。</span>
A:错误
B:正确

<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">电极电位既能判断氧化还原反应进行的方向，又能判断氧化还原反应进行的程度，还能判断氧化还原反应的快慢。</span>
A:错误
B:正确

<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">标定溶液时，若基准物吸潮而纯度不高所引起的试剂误差可用空白试验校正。</span>
A:错误
B:正确