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Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

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BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 15, Problem 1E
Textbook Problem
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Explain, in terms of molecules, why the stickiness of eating an orange is easily washed off hands with just plain water, whereas the greasiness of eating french fries requires soap.

Interpretation Introduction

Interpretation:

The reason for the statement, “The stickiness of eating an orange is easily washed off hands with just plain water, whereas the greasiness of eating French fries requires soap,” is to be explained.

Concept introduction:

Soap is a water-soluble compound, which is used for washing and cleaning purpose. It is made up of natural oil or fat treated with sodium hydroxide or another strong base. In short, soaps are surfactants, that is, they are dissolved in water and oil.

Detergent is more effective than soap because it contains one or more surfactants.

Explanation of Solution

The stickiness of orange is easily washed off with just plain water because citric acid is polar and a weak organic acid and the chemical formula for citric acid is C6H8O7. Water is made up of one negatively charged oxygen atom and two positively charged hydrogen atom, that is, a polar molecule. So, the positive end of the water molecule is attracted to the negative end of the citric acid molecule

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Chapter 15 Solutions

Chemistry In Focus
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