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Arturiano [62]
3 years ago
5

In the soap testing experiment, what is the purpose of adding some MgCl2 to the soap solution at the end?

Chemistry
1 answer:
lakkis [162]3 years ago
4 0

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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Answer:

The answer is

<h2>2.143 \times  {10}^{18}  \:  \: atoms</h2>

Explanation:

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From the question

n = 3.559 \times  {10}^{ - 6}  \: mol

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We have the final answer as

<h3>N  = 2.143 \times  {10}^{18}  \:  \: atoms</h3>

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