已知:\(\rm{2KMnO_{4}+5H_{2}C_{2}O_{4}+3H_{2}SO_{4}═K_{2}SO_{4}+2MnSO_{4}+10CO_{2}↑+8H_{2}O.}\)
某化学小组根据上述反应原理进行下列实验:
I.测定\(\rm{H_{2}C_{2}O_{4}}\)溶液的物质的量浓度
实验步骤如下:
\(\rm{①}\)取待测\(\rm{H_{2}C_{2}O_{4}}\)溶液\(\rm{25.00mL}\)放入锥形瓶中,再加入适量的稀硫酸;
\(\rm{②}\)用\(\rm{0.1mol/L}\) \(\rm{KMnO_{4}}\)溶液滴定至终点,记录数据;
\(\rm{③}\)重复滴定\(\rm{2}\)次,平均消耗\(\rm{KMnO_{4}}\)溶液\(\rm{20.00mL}\).
请回答:
\(\rm{(1)}\)滴定时,将\(\rm{KMnO_{4}}\)溶液装在 ______ \(\rm{(}\)填“酸式”或“碱式”\(\rm{)}\)滴定管中.
\(\rm{(2)}\)若在步骤\(\rm{①}\)操作之前,先用待测\(\rm{H_{2}C_{2}O_{4}}\)溶液润洗锥形瓶,则测得\(\rm{H_{2}C_{2}O_{4}}\)溶液的浓度会 ______ \(\rm{(}\)填“偏大”“偏小”或“无影响”\(\rm{)}\).
\(\rm{(3)}\)步骤\(\rm{②}\)中到达滴定终点时的现象为 ______ .
\(\rm{(4)}\)计算\(\rm{H_{2}C_{2}O_{4}}\)溶液的物质的量浓度为 ______ \(\rm{mol/L}\).
\(\rm{II.}\)探究反应物浓度对化学反应速率的影响设计如下实验方案\(\rm{(}\)实验温度均为\(\rm{25℃)}\):
实验序号 | 体积\(\rm{V/mL}\) |
\(\rm{0.1mol⋅L^{-1}KMnO_{4}}\)溶液 | \(\rm{0.11mol⋅L^{-1}H_{2}C_{2}O_{4}}\)溶液 | \(\rm{0.11mol⋅L^{-1}H_{2}SO_{4}}\)溶液 | \(\rm{H_{2}O}\) |
\(\rm{①}\) | \(\rm{2.0}\) | \(\rm{5.0}\) | \(\rm{6.0}\) | \(\rm{7.0}\) |
\(\rm{②}\) | \(\rm{2.0}\) | \(\rm{8.0}\) | \(\rm{6.0}\) | \(\rm{V_{1}}\) |
\(\rm{③}\) | \(\rm{2.0}\) | \(\rm{V_{2}}\) | \(\rm{6.0}\) | \(\rm{2.0}\) |
请回答:
\(\rm{(5)}\)表中\(\rm{v_{1}=}\) ______ ,\(\rm{V_{2}=}\) ______ .
\(\rm{(6)}\)实验中需要测量的数据是 ______ .
\(\rm{(7)}\)实验中 ______ \(\rm{(}\)填“能”或“不能”\(\rm{)}\)用\(\rm{0.2mol/L}\)盐酸代替\(\rm{0.1mol/LH_{2}SO_{4}}\)溶液,理由是 ______ .