24小时热门版块排行榜    

CyRhmU.jpeg
查看: 5196  |  回复: 23

ZANCAI

新虫 (著名写手)

引用回帖:
20楼: Originally posted by hwweven at 2012-08-27 21:23:46
不是,第二种,15g加到100mL中,很少加85mL这么做的,一来计算非常麻烦,二来添加15g不可能增大15mL,那样配最终的浓度也不对,而第二种配的方法刚好差不多。配化学镀溶液时要加七八种料,就是这么加的。...

好的 明白了。
21楼2012-08-27 22:18:06
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

bigben446

铜虫 (初入文坛)

3 w/v 质量浓度
x质量固体溶于某溶剂中,终体积y

Mass concentration
In chemistry, the mass concentration  (or ) is defined as the mass of a constituent  divided by the volume of the mixture :[1]
The volume  in the definition refers to the volume of the solution, not the volume of the solvent. One liter of a solution usually contains either slightly more or slightly less than 1 liter of solvent because the process of dissolution causes volume of liquid to increase or decrease. Sometimes the mass concentration is called titer.
https://en.wikipedia.org/wiki/Mass_concentration_(chemistry)
22楼2016-03-19 00:39:04
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

bigben446

铜虫 (初入文坛)

Mass-volume percentage,重量体积比
Mass-volume percentage,v指的是溶液终体积而不是溶剂体积
Mass-volume percentage, (sometimes referred to as weight-volume percentage or percent weight per volume and often abbreviated as % m/v or % w/v) describes the mass of the solute in g per 100 mL of the resulting solution. Mass-volume percentage is often used for solutions made from a solid solute dissolved in a liquid. For example, a 40% w/v sugar solution contains 40 g of sugar per 100 mL of resulting solution.
23楼2016-03-19 00:56:13
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

被占了

银虫 (小有名气)

3 是对的, 2的意思和3差不多。

w/v  就是 质量/体积     15% ——用80ml溶剂溶解15g高分子,然后定容到100ml
没有等出来的辉煌,只有做出来的成功。
24楼2016-08-22 16:27:17
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 ZANCAI 的主题更新
信息提示
请填处理意见