确定用EDTA滴定金属离子的适宜的酸度范围时,首先,要考虑溶液的pH值应()允许的最小pH值。A、小于B、大于C、等于D、大于等于...
Wednesday, December 20, 2023
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Saturday, September 10, 2022
用托盘天平称取一定数量的试样,砝码应放在左边的托盘上。...
Wednesday, October 25, 2023
需配制10%(g/mL)NH4Cl溶液1000毫升,现有30%(g/mL)和5%(g/mL)NH4Cl溶液两种,应如何配制?...
Wednesday, December 14, 2022
Tuesday, September 13, 2022
Saturday, September 10, 2022
Tuesday, September 13, 2022
把3.65克氯化氢溶解于水里制成1升溶液,这种盐酸的物质的量浓度为()A、0.1mol/LB、0.2mol/LC、0.8mol/LD、0.4mol/L...
Saturday, May 27, 2023
开口闪点是条件很强的测试方法,不同的升温速度下测得的结果不可以比...
Tuesday, September 13, 2022
铂又叫白金,在高温下略有一些挥发性,灼烧时间久时要加以校正。...
Tuesday, September 13, 2022
Tuesday, September 13, 2022
烘箱超温时立即切断电源,不要马上打开烘箱门,以免内门玻璃破裂。...
Tuesday, September 13, 2022
Tuesday, September 13, 2022
1211灭火器的特点是灭火效率高、腐蚀性小、但留痕迹。...
Tuesday, September 13, 2022
Friday, September 16, 2022
化验室蒸馏低沸点易燃液体时,应采用密闭式电热管的()或(),尽量避免用()。...
Tuesday, February 14, 2023
在电解含有Ag离子的溶液时.欲使阴极析出1摩尔的银。问需通入的电量是多少?已知每个电子的电荷电量是1.602×10-19库仑,阿伏伽德罗常数NA为6.023×1023...
Sunday, December 31, 2023
Tuesday, September 13, 2022