肥皂会变脏吗？
<p><span word="Can">Can</span> <span word="Soap">Soap</span> <span word="Get">Get</span> <span word="Dirty">Dirty</span>?</p><p>肥皂会变脏吗？</p><p><span word="When">When</span> <span word="you">you</span> <span word="see">see</span> <span word="lovely">lovely</span> <span word="little">little</span> <span word="bars">bars</span> <span word="of">of</span> <span word="lemon">lemon</span>-<span word="thyme">thyme</span> <span word="or">or</span> <span word="lavender">lavender</span> <span word="hand">hand</span> <span word="soaps">soaps</span> <span word="on">on</span> <span word="the">the</span> <span word="rim">rim</span> <span word="of">of</span> <span word="a">a</span> <span word="sink">sink</span>, <span word="you">you</span> <span word="know">know</span> <span word="they">they</span> <span word="are">are</span> <span word="there">there</span> <span word="to">to</span> <span word="make">make</span> <span word="you">you</span> <span word="feel">feel</span> <span word="as">as</span> <span word="fresh">fresh</span> <span word="as">as</span> <span word="a">a</span> <span word="gardenia">gardenia</span>-<span word="scented">scented</span> <span word="daisy">daisy</span>. <span word="We">We</span> <span word="all">all</span> <span word="know">know</span> <span word="washing">washing</span> <span word="our">our</span> <span word="hands">hands</span> <span word="is">is</span> <span word="important">important</span>, <span word="but">but</span>, <span word="like">like</span> <span word="washcloths">washcloths</span> <span word="and">and</span> <span word="towels">towels</span>, <span word="can">can</span> <span word="the">the</span> <span word="bars">bars</span> <span word="of">of</span> <span word="hand">hand</span> <span word="soap">soap</span> <span word="we">we</span> <span word="use">use</span> <span word="to">to</span> <span word="clean">clean</span> <span word="ourselves">ourselves</span> <span word="become">become</span> <span word="dirty">dirty</span> <span word="as">as</span> <span word="well">well</span>?</p><p>当你看到水池边可爱的柠檬百里香或薰衣草香皂时，你就知道它能让你感受到如栀子花香的雏菊般清新动人。众所周知，洗手很重要，但就像毛巾一样，我们用来清洁双手的洗手皂也会变脏吗?</p><p><span word="Soaps">Soaps</span> <span word="are">are</span> <span word="simply">simply</span> <span word="mixtures">mixtures</span> <span word="of">of</span> <span word="sodium">sodium</span> <span word="or">or</span> <span word="potassium">potassium</span> <span word="salts">salts</span> <span word="derived">derived</span> <span word="from">from</span> <span word="fatty">fatty</span> <span word="acids">acids</span> <span word="and">and</span> <span word="alkali">alkali</span> <span word="solutions">solutions</span> <span word="during">during</span> <span word="a">a</span> <span word="process">process</span> <span word="called">called</span> <span word="saponification">saponification</span>. <span word="Each">Each</span> <span word="soap">soap</span> <span word="molecule">molecule</span> <span word="is">is</span> <span word="made">made</span> <span word="of">of</span> <span word="a">a</span> <span word="long">long</span>, <span word="non">non</span>-<span word="polar">polar</span>, <span word="hydrophobic">hydrophobic</span> (<span word="repelled">repelled</span> <span word="by">by</span> <span word="water">water</span>) <span word="hydrocarbon">hydrocarbon</span> <span word="chain">chain</span> (<span word="the">the</span> "<span word="tail">tail</span>") <span word="capped">capped</span> <span word="by">by</span> <span word="a">a</span> <span word="polar">polar</span>, <span word="hydrophilic">hydrophilic</span> (<span word="water">water</span>-<span word="soluble">soluble</span>) "<span word="salt">salt</span>" <span word="head">head</span>. <span word="Because">Because</span> <span word="soap">soap</span> <span word="molecules">molecules</span> <span word="have">have</span> <span word="both">both</span> <span word="polar">polar</span> <span word="and">and</span> <span word="non">non</span>-<span word="polar">polar</span> <span word="properties">properties</span>, <span word="they">they</span>'<span word="re">re</span> <span word="great">great</span> <span word="emulsifiers">emulsifiers</span>, <span word="which">which</span> <span word="means">means</span> <span word="they">they</span> <span word="can">can</span> <span word="disperse">disperse</span> <span word="one">one</span> <span word="liquid">liquid</span> <span word="into">into</span> <span word="another">another</span>.</p><p>肥皂仅仅只是由脂肪酸和碱溶液在皂化过程中产生的钠盐或钾盐的混合物。每个肥皂分子都是由一个长而非极性的疏水(被水排斥)碳氢化合物链(“尾巴”)和其顶端的一个极性亲水(水溶性)碳氢化合物盐链构成。由于肥皂分子具有极性和非极性的特性，它们是很好的乳化剂，这意味着它们可以将一种液体溶解到另一种液体中。</p>
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