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7. Procedure(填空)Use of the spectrophotometer: please order the experimental steps ___, ___, ___, ___, ___, ___.(仅需填入数字,不带标点符号和空格)1- turn on the power, spectrophotometer warm-up2- pull the cuvette holder lever, read the absorbance value of the solution3- close the lid (or using a black cuvette) to adjust the T% to zero4- Using the solution of tube 1 to adjust T% to 100%5- repeat the adjustment of T% until stable readings6- choose a wavelength

7. Procedure(填空) Use of the spectrophotometer: please order the experimental steps ___, ___, ___, ___, ___, ___.(仅需填入数字,不带标点符号和空格) 1- turn on the power, spectrophotometer warm-up 2- pull the cuvette holder lever, read the absorbance value of the solution 3- close the lid (or using a black cuvette) to adjust the T% to zero 4- Using the solution of tube 1 to adjust T% to 100% 5- repeat the adjustment of T% until stable readings 6- choose a wavelength

题目解答

答案

解析

使用分光光度计的实验步骤需要按照一定的顺序进行,以确保测量的准确性和可靠性。下面是每个步骤的详细解释:

  1. 打开电源,分光光度计预热:这是第一步,确保仪器处于工作状态,预热时间通常为10-15分钟,以确保仪器的稳定性和准确性。
  2. 选择波长:根据实验需要,选择合适的波长。波长的选择取决于待测物质的吸收特性。
  3. 使用空白溶液调整透光率(T%)到100%:将空白溶液(通常是溶剂)放入比色皿中,调整仪器使透光率(T%)为100%。这一步是为了校准仪器,消除溶剂的干扰。
  4. 关闭比色皿盖(或使用黑色比色皿)调整透光率(T%)到0%:这一步是为了确保仪器在没有光通过时,透光率读数为0%。
  5. 重复调整透光率(T%)直到读数稳定:这一步是为了确保仪器的读数稳定,避免因仪器不稳定导致的误差。
  6. 拉下比色皿架杠杆,读取溶液的吸光度值:将待测溶液放入比色皿中,拉下比色皿架杠杆,读取吸光度值。

答案

根据上述解析,正确的实验步骤顺序为:

1-7-6-4-3-5-2

但是题目要求只填数字,不带标点符号和空格,因此答案为:

164352

解析

本题考查分光光度计的使用步骤,解题思路是依据分光光度计正常的操作流程,对每个步骤进行合理排序。

详细步骤分析

  1. 打开电源,分光光度计预热:这是使用分光光度计的首要步骤。仪器需要一定时间达到稳定的工作状态,通常预热时间为10 - 15分钟,这样能保证后续测量的准确性和可靠性。所以这一步是第一步,对应数字1。
  2. 选择波长:在仪器预热完成后,要根据待测物质的吸收特性来选择合适的波长。不同物质在不同波长下的吸收程度不同,选择正确的波长才能准确测量物质的吸光度。所以这一步是第二步,对应数字6。
  3. 使用空白溶液调整透光率(T%)到100%:将空白溶液(一般是溶剂)放入比色皿中,通过调整仪器使透光率(T%)达到100%。这一步的目的是校准仪器,消除溶剂对测量结果的干扰。所以这一步是第三步,对应数字4。
  4. 关闭比色皿盖(或使用黑色比色皿)调整透光率(T%)到0%:此步骤是为了确保仪器在没有光通过时,透光率读数为0%,进一步校准仪器。所以这一步是第四步,对应数字3。
  5. 重复调整透光率(T%)直到读数稳定:为了避免因仪器不稳定导致的误差,需要重复调整透光率,直到读数稳定。所以这一步是第五步,对应数字5。
  6. 拉下比色皿架杠杆,读取溶液的吸光度值:将待测溶液放入比色皿中,拉下比色皿架杠杆,此时仪器会显示溶液的吸光度值。所以这一步是第六步,对应数字2。

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