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Ⅰ、（8分）有一学生在实验室测某溶液的pH。实验时，他先用蒸馏水润湿pH试纸，然后用洁净干燥的玻璃棒醮取试样进行检测。 （1）该学生的操作是____ ____（填“正确的”或“错误的”）。 （2）如不正确，是否一定有误差？答：____（填“是”或“否”） （3）若按此法分别测定C（H ＋ ）相等的盐酸和醋酸溶液的pH，误差较大的是____，原因是____ ____。 Ⅱ、（10分） （1）如图表示50mL滴定管中液面的位置，其读数是 mL （2）酸俗名草酸，某化学学习小组的同学欲探究测定 草酸晶体（H 2 C 2 O 4 · x H 2 O）中 x 值。通过查阅资料得，草酸易溶于水，水溶液可以用酸性KMnO 4 溶液进行滴定：2MnO 4 － ＋5H 2 C 2 O 4 ＋6H + 2Mn 2 ＋ ＋10CO 2 ↑＋8H 2 O该组同学设计了滴定的方法测定 x 值。请回答：①、下列仪器在进行滴定时，绝不可以事先润洗的是 （填编号）。 甲．酸式滴定管 乙．碱式滴定管 丙．25 mL量筒 丁．锥形瓶 ②、滴定时，将KMnO 4 标准液装在 滴定管中。 ③、本实验滴定达到终点的标志可以是 。 ④、若滴定终点时俯视滴定管刻度，则由此测得的 x 值会 （填“偏大”、“偏小”或“不变”）。
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