天气预报15天查询> 其他> 1酚酞如何配制

1酚酞如何配制

更新时间: 2020-07-07 00:00:00     

普通有三种方法:

1、将1g酚酞溶于60毫升乙醇中,用水稀释至100毫升定容;

2、将1g酚酞溶于百分之90乙醇中,定量至100毫升定容;

3、将1g酚酞溶于100毫升乙醇中定容。

酚酞:白色或微带黄色的结晶粉末,无臭,无味。密度1、277克每立方厘米。熔点257-259摄氏度。不溶于冷水,加热时溶解较多。溶于乙醇和乙醚。故溶剂不能用水或单纯的用水。

关键词: 酚酞 如何 配制

如有意见、反馈、侵权或投诉等情况,请联系:

电话:
邮箱:

我们将会在48小时内给与处理!

版权所有 Copyright ? 2009-2020 tianqiyubao3.com

页面:/news/view-220759/ | 耗时:0.6802 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=220759 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=220759 LIMIT 0,1
select * from tbl_Articles_sphinx where id=220759 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2459511,1073276,115719,2488637,107233,108977,3128268,1102206,112480,115486,1130298,117590,2077262,110963,3404635,119965,116160,1051239,1079952,1065675,1079051,115637,108414,2444547,114440,119562,2721253,116150,116203,114127) ORDER BY field (ArticleID,2459511,1073276,115719,2488637,107233,108977,3128268,1102206,112480,115486,1130298,117590,2077262,110963,3404635,119965,116160,1051239,1079952,1065675,1079051,115637,108414,2444547,114440,119562,2721253,116150,116203,114127)