piyopiyo 發表於 23-4-2008 19:57:02

soapless detergent

02年的一題...
NaOH 點樣be used in manufacture of soapless detergent

[ 本帖最後由 piyopiyo 於 23-4-2008 20:06 編輯 ]

Puppet 發表於 23-4-2008 20:33:56

soapless detergent多數係sodium salt of -SO3H / -O-SO3H

jackiema 發表於 23-4-2008 22:09:14

八卦問問:
manufacture of soapless detergent 係唔係 out of syllabus?

包包 klau1001 發表於 23-4-2008 23:09:44

原帖由 jackiema 於 23-4-2008 22:09 發表 http://www.nakuz.com/bbs/images/common/back.gif
八卦問問:
manufacture of soapless detergent 係唔係 out of syllabus?
印象中係Out左...
soap 就in

piyopiyo 發表於 24-4-2008 06:53:06

即是我做呢題都是 out syl?[]

Puppet 發表於 24-4-2008 07:29:37

No, it isn't.
One needs to know soapless detergents are made from petroleum fractions, conc. sulphuric acid and sodium hydroxide. Only equations are not required.

jacky2580 發表於 24-4-2008 21:58:09

NaOH 係 catalyst定係reactant？

jackiema 發表於 24-4-2008 22:15:29

原帖由 jacky2580 於 24-4-2008 21:58 發表 http://www1.nakuz.com/bbs/images/common/back.gif
NaOH 係 catalyst定係reactant？
reactant 掛...
detergent 佢有個 Na+ / K+ cation 架喎

包包 klau1001 發表於 25-4-2008 07:17:09

原帖由 jackiema 於 24-4-2008 22:15 發表 http://www.nakuz.com/bbs/images/common/back.gif

reactant 掛...
detergent 佢有個 Na+ / K+ cation 架喎
有一年PP話佢係catalyst...

學校呀sir話因為the reactants reacts better in alkaline medium...
所以OH- 是catalyst
而Na+ 就係reactant..
佢話呢條q出得唔好...

[ 本帖最後由 包包 klau1001 於 25-4-2008 07:21 編輯 ]

Puppet 發表於 25-4-2008 13:21:36

原帖由 包包 klau1001 於 25-4-2008 07:17 發表 http://www.nakuz.com/bbs/images/common/back.gif

有一年PP話佢係catalyst...

學校呀sir話因為the reactants reacts better in alkaline medium...
所以OH- 是catalyst
而Na+ 就係reactant..
佢話呢條q出得唔好...
果條講的是soapy detergents
做soapless detergents加NaOH唔係cat.

在soapy同soapless detergents的製造裡,
Na+都只係spectator ions
OH-實係reactant, OH- + R-COOH ---> H2O + R-COO(-)
Controversial的只是在saponification內NaOH是否cat.
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