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FionaSupernova FionaSupernova
wrote...
Posts: 7
Rep: 3 0
9 years ago
a) that shows why its solutions are alkaline.
b) for its reaction with Mg+2 in hard water.
c) for its reaction with hydrochloric acid.
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Replies
wrote...
Staff Member
Educator
9 years ago
Assuming a soap to be pure sodium stearate, give balanced equation to illustrate the following:?

a) Why its solutions are alkaline:
b) Its reaction with Ca+2 in hard water:



a) CH3-(CH2)16-COONa+HCl=CH3-(CH2)16-COOH + NaCl

b) 2CH3-(CH2)16-COONa+CaCO3=(CH3-(CH2)1... +Na2CO3
- the second reaction explains why soap doesn't make as many "bubbles" in hard water
hope this two reaction are enough for you.
Mastering in Nutritional Biology
Tralalalala Slight Smile
wrote...
9 years ago
An aqueous solution of sodium stearate will react with Ca2+ ions in hard water to give an insoluble precipitate of calcium stearate:

2 C17H35COONa(aq) + Ca2+(aq) Rightwards Arrow (C17H35COO)2Ca(s) + 2 Na+(aq)
wrote...
Valued Member
Educator
9 years ago
Question was cut off, could you please write it down fully below, thanks.
Answer accepted by topic starter
FionaSupernova AuthorFionaSupernova
wrote...
Posts: 7
Rep: 3 0
9 years ago Edited: 9 years ago, FionaSupernova
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This verified answer contains over 290 words.
eward,  Olivia Bartlett
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wrote...
Valued Member
Educator
9 years ago
Hi FionaSupernova,

Could you give us a little update on what you did to tackle this problem?
wrote...
9 years ago Edited: 9 years ago, FionaSupernova
Hi FionaSupernova,

Could you give us a little update on what you did to tackle this problem?

we were made to prepare soap and compare it with syndets. those were the questions in the post lab actually. the prepared soap and syndets were subjected to solutions like fe-, mg-, and ca- as well as with tap water and we were made to observe precipitates. i just discussed the results as the theories stated how things should be... though my results were quite inconsistent with the theories. i may have done the experiment wrongly too. Slight Smile
AMDG+
wrote...
4 years ago Edited: 4 years ago, Mackenzie Rae
0
wrote...
3 years ago
Thanks
wrote...
3 years ago
thanks
wrote...
3 years ago
Thank you
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