LAB 13 REFLECTIVE Lab Section LAB 13 REFLECTIVE EXERCISES Lab Partner Lab Sectio

Question

LAB 13 REFLECTIVE Lab Section LAB 13 REFLECTIVE EXERCISES Lab Partner Lab Section 7 Synthetic detengents, such as sodium dodecylbenzenesultfonate, were developed in order to overoome the production of soap scum in hard water. These cleaners are structurally similar to ordinary soaps, but the polar regjon typically is a suffonate group rather than a carboxylate. sulfonate group sodium a According to your results from Part B, did the detergent behave differently than the natural soap treated with Ca ES same manner as an ordinary soap molecule? Explain. b Would you expect a detergent such as sodium dodeoylbenzenesulifonate to react with hard water cations in the c Does the contrast in solubilities between soaps and detergents reflect a difference in the chemical or physical properties of these substances? Describe how the structural modification in a typical detergent alters the compound's solubility in hard water compared to a soap.

Explanation / Answer

7.

a. Yes

b. The sodium dodecylbenzene sulfonate reacts in the same manner as the ordinary soap, but it does not produce soap scum. This is because this soap is still ionic in nature and has Na+ cation which can get exchanged with another non-metal. Thus the other part of sodium dodecylsulfonate is reacting with the hard water cation.

c. The ability of synthetic detergents to remain in ionic form makes it more user friendly producing less soap scum and compared to the ordinary soap which are non-ionic upon reaction. So solubility in hard water is lesser for ordinary soap as compared to detergents and are better for cleaning.

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