In the soap testing experiment, what is the purpose of adding some mgcl2 to the soap solution at the end?
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Ответ:
Explanation:
The water is hard due to the presence of ions of Mg²⁺. Now in hard water soaps are ineffective . Since in hard water Mg²⁺ ion forms precipitate , which concludes less number of soap molecules are present in the solution and less amount of froth which disables the cleansing property of the soap .
Now the experiment , the very last step is the hard water test where some amount of MgCl₂ is added ,
Now this magnesium salt act as a source of Mg²⁺ ion and now the soap action can be determined , whether it is able to form froth or not .
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2 And 3 are the correct ones on edge i just took the quiz