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Two different samples of water (I and II) were tested with soap solution

      

Two different samples of water (I and II) were tested with soap solution. Sample II was further subjected to two other processes before adding soap. 20 cm3 of each sample of water was shaken with soap solution in a boiling tube until a permanent lather was obtained. The results are as shown in the table below.
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i) Identify the water sample that had temporary hardness. Explain your answer
ii) Explain why the results for sample II are different after distilling but remain unchanged after filtering
iii) State two disadvantages of using both water samples for domestic purposes.

  

Answers


John
i) –Water sample I

-This is because the amount of soap needed to lather reduces after the water boiled.

ii) This is because the sample contains water which has permanent hardness. This hardness cannot be
removed by filtration but is removed through distillation.

iii) – Leads to wastage of soap during washing
-Deposits fur in boilers which reduces the efficiency of boilers
johnmulu answered the question on April 27, 2017 at 06:53


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