UC知道高分,化学实验的翻译,请指教!
来源：百度知道 编辑：UC知道 时间：2024/07/07 09:37:25
Equipment
1. PH meter and combination PH electrode.
2. 50ml disposable containers.
3. Disposable pipettes.
4. Magnetic stirrer.
Reagents
1. Buffer solution – PH 4 at 25 degree.
2. Buffer solution - PH 5 at 25 degree.
3. Buffer solution – PH 7 at 25 degree.
4. Deionised water.
5. 0.1N sodium hydroxide solution.
6. 0.1N hydrochloric acid.
7. 0.5N sodium nitrate (4.25g sodium nitrate in 100ml water).
Procedure
1. Calibrate the PH meter according to the manufacturers instructions using the PH 4 and PH 7 buffer solutions. Check the accuracy of the meter using the PH 5 buffer solution.
2. Place the PH electrode in 500ml of deionised water (stirring) and add 500ml 0.5N sodium nitrate solution.
3. If necessary, adjust the PH of the deionised water with 0.1N NaOH or 0.1N HCI to give a PH reading between 5.8 and 6.2. After the adjustment, allow the reading to stabilize and ensure that it remains stable i
1. PH meter and combination PH electrode.
2. 50ml disposable containers.
3. Disposable pipettes.
4. Magnetic stirrer.
Reagents
1. Buffer solution – PH 4 at 25 degree.
2. Buffer solution - PH 5 at 25 degree.
3. Buffer solution – PH 7 at 25 degree.
4. Deionised water.
5. 0.1N sodium hydroxide solution.
6. 0.1N hydrochloric acid.
7. 0.5N sodium nitrate (4.25g sodium nitrate in 100ml water).
Procedure
1. Calibrate the PH meter according to the manufacturers instructions using the PH 4 and PH 7 buffer solutions. Check the accuracy of the meter using the PH 5 buffer solution.
2. Place the PH electrode in 500ml of deionised water (stirring) and add 500ml 0.5N sodium nitrate solution.
3. If necessary, adjust the PH of the deionised water with 0.1N NaOH or 0.1N HCI to give a PH reading between 5.8 and 6.2. After the adjustment, allow the reading to stabilize and ensure that it remains stable i
1. PH用表计量和组合PH电极. 2. 50ml一次性的容器. 3. 一次性的吸管. 4. 磁煽动者. Re.
经纪人1. 缓冲器[解决办法;溶液].
–
PH4在25度上. 2. 缓冲器[解决办法;溶液]-PH5在25度上. 3. 缓冲器[解决办法;溶液].
–
PH7在25度上. 4. 除去水的离子. 5. 0.1N钠氢氧化物[解决办法;溶液]. 6. 0.1Nhydrochloric酸. 7. 0.5N钠nitra.
te"4.25g钠硝酸盐在100ml里加水". 程序1. 校准PH的[计价器;仪表;米]按照制造商[说明;指示;教学].
使用PH4和PH7的缓冲器[解决办法;溶液]. 检查[解决办法;溶液]的精确度. 2. 放置PH的ele.
ctrode除去水的离子在500ml里"[活动;激动人心]"并且添加500ml0.5N钠硝酸盐[解决办法;溶液]. 3. 如有必要,[调节;适应]PHt.
他除去水的离子与0.1N·NaOH(一起)或0.1N·HCI在5.8和6.2之间给出一PH的阅读. 在调整之后,允许readin.
g稳定并且确保它在必需的范围上仍然是稳定因为至少1分钟. 4. [录制;登录]PHdeionis.
e加水. 5. 精确地sucralose进入一50ml容器变成粉末[称一下;重量是]2.0g. 接近20g随着[调节;适应]除去wate的离子.
r. [摇动;握手;奶昔]很好地溶解sucralose. 6. [测量;仔细考虑][解决办法;溶液]的pH,[以前;面前]允许读到稳定
[录制;登录]它.