<![CDATA[
<p>'유리애자는<span style="font-size: 9pt;">70% 이상의 성분이 규토(Silica SiO2)로 구성되어 있고 </span><span style="font-size: 9pt;">저온으로 융해</span><span style="font-size: 9pt;">하기 위하여 NaO를, </span><span style="font-size: 9pt;">내구성 향상을 위하여 CaO를</span><span style="font-size: 9pt;">제작상의 편리와 특성 유지를 위하여 MgO, Al2O3, K2O 등의 성분을 </span><span style="font-size: 9pt;">적당한 비율로 배합하여 제작한다.' 라는 전기공사기사 단답 기출 문제가 있습니다. </span></p><p><span style="font-size: 9pt;"><br></span></p><p><span style="font-size: 9pt;"> 여기서 저온으로 융해하기 위해 넣어주는 산화나트륨에 대한 화학식이 다산교재와 인터넷을 몇몇 블로그에는 NaO라고 되어있는데 탈자가 포함된 글을 퍼나르면서 수정하지 않고 올린것 같습니다. 제가 알고있는 화학지식으로는 알칼리 금속은 항상 +1가로 작용하고 산화수의 우선 순위가 -2인 산소보다 높기때문에 화학식이 Na2O가 맞다고 알고 있습니다. </span></p><p><span style="font-size: 9pt;"><br></span></p><p><span style="font-size: 9pt;">영문 위키피디아 <a href="https://en.wikipedia.org/wiki/Sodium_oxide" target="_blank" class="tx-link">https://en.wikipedia.org/wiki/Sodium_oxide</a>에도 화학식이 Na2O라고 되어있습니다. 고수님들께 확인 부탁드립니다. </span></p><p><span style="font-size: 9pt;"><br></span></p><p><b style="color: rgb(34, 34, 34); font-family: sans-serif; font-size: 14px;">Sodium oxide</b><span style="color: rgb(34, 34, 34); font-family: sans-serif; font-size: 14px;"> is a </span><a href="https://en.wikipedia.org/wiki/Chemical_compound" title="Chemical compound" style="color: rgb(11, 0, 128); background-image: none; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; font-family: sans-serif; font-size: 14px;">chemical compound</a><span style="color: rgb(34, 34, 34); font-family: sans-serif; font-size: 14px;"> with the formula </span><a href="https://en.wikipedia.org/wiki/Sodium" title="Sodium" style="color: rgb(11, 0, 128); background-image: none; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; font-family: sans-serif; font-size: 14px;">Na</a><sub style="line-height: 1; font-size: 11.2px; color: rgb(34, 34, 34); font-family: sans-serif;">2</sub><a href="https://en.wikipedia.org/wiki/Oxygen" title="Oxygen" style="color: rgb(11, 0, 128); background-image: none; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; font-family: sans-serif; font-size: 14px;">O</a><span style="color: rgb(34, 34, 34); font-family: sans-serif; font-size: 14px;">. It is used in </span><a href="https://en.wikipedia.org/wiki/Ceramic" title="Ceramic" style="color: rgb(11, 0, 128); background-image: none; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; font-family: sans-serif; font-size: 14px;">ceramics</a><span style="color: rgb(34, 34, 34); font-family: sans-serif; font-size: 14px;"> and </span><a href="https://en.wikipedia.org/wiki/Glass" title="Glass" style="color: rgb(11, 0, 128); background-image: none; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; font-family: sans-serif; font-size: 14px;">glasses</a><span style="color: rgb(34, 34, 34); font-family: sans-serif; font-size: 14px;">, though not in a raw form. It is the </span><a href="https://en.wikipedia.org/wiki/Base_anhydride" title="Base anhydride" style="color: rgb(11, 0, 128); background-image: none; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; font-family: sans-serif; font-size: 14px;">base anhydride</a><span style="color: rgb(34, 34, 34); font-family: sans-serif; font-size: 14px;"> of </span><a href="https://en.wikipedia.org/wiki/Sodium_hydroxide" title="Sodium hydroxide" style="color: rgb(11, 0, 128); background-image: none; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; font-family: sans-serif; font-size: 14px;">sodium hydroxide</a><span style="color: rgb(34, 34, 34); font-family: sans-serif; font-size: 14px;">, so when water is added to sodium oxide NaOH is produced.</span><br></p><p><span style="color: rgb(34, 34, 34); font-family: sans-serif; font-size: 14px;"><br></span></p><h3 style="color: rgb(0, 0, 0); background-image: none; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; margin: 0.3em 0px 0px; overflow: hidden; padding-top: 0.5em; padding-bottom: 0px; border-bottom: 0px; font-size: 1.2em; line-height: 1.6; font-family: sans-serif;"><span class="mw-headline" id="Glass_making">Glass making</span><span class="mw-editsection" style="user-select: none; font-size:10pt; font-weight: normal; margin-left: 1em; vertical-align: baseline; line-height: 1em; display: inline-block; white-space: nowrap; unicode-bidi: isolate;"><span class="mw-editsection-bracket" style="margin-right: 0.25em; color: rgb(84, 89, 93);">[</span><a href="https://en.wikipedia.org/w/index.php?title=Sodium_oxide&action=edit&section=3" title="Edit section: Glass making" style="color: rgb(11, 0, 128); background: none;">edit</a><span class="mw-editsection-bracket" style="margin-left: 0.25em; color: rgb(84, 89, 93);">]</span></span></h3><p style="margin-top: 0.5em; margin-bottom: 0.5em; line-height: inherit; color: rgb(34, 34, 34); font-family: sans-serif; font-size: 14px;">Sodium oxide is a significant component of glasses and windows although it is added in the form of "soda" (<a href="https://en.wikipedia.org/wiki/Sodium_carbonate" title="Sodium carbonate" style="color: rgb(11, 0, 128); background: none;">sodium carbonate</a>). Sodium oxide does not explicitly exist in glasses, since glasses are complex cross-linked polymers. Typically, manufactured <a href="https://en.wikipedia.org/wiki/Glass" title="Glass" style="color: rgb(11, 0, 128); background: none;">glass</a> contains around 15% sodium oxide, 70% silica (<a href="https://en.wikipedia.org/wiki/Silicon_dioxide" title="Silicon dioxide" style="color: rgb(11, 0, 128); background: none;">silicon dioxide</a>) and 9% lime (<a href="https://en.wikipedia.org/wiki/Calcium_oxide" title="Calcium oxide" style="color: rgb(11, 0, 128); background: none;">calcium oxide</a>). The sodium carbonate "soda" serves as a flux to lower the temperature at which the silica melts. Soda glass has a much lower melting temperature than pure silica, and has slightly higher elasticity. These changes arise because the silicon dioxide and soda react to form sodium silicates of the general formula Na<sub style="line-height: 1; font-size: 11.2px;">2</sub>[SiO<sub style="line-height: 1; font-size: 11.2px;">2</sub>]<sub style="line-height: 1; font-size: 11.2px;">x</sub>[SiO<sub style="line-height: 1; font-size: 11.2px;">3</sub>].</p><dl style="margin-top: 0.2em; margin-bottom: 0.5em; color: rgb(34, 34, 34); font-family: sans-serif; font-size: 14px;"><dd style="margin-left: 1.6em; margin-bottom: 0.1em; margin-right: 0px;">Na<sub style="line-height: 1; font-size: 11.2px;">2</sub>CO<sub style="line-height: 1; font-size: 11.2px;">3</sub> → Na<sub style="line-height: 1; font-size: 11.2px;">2</sub>O + CO<sub style="line-height: 1; font-size: 11.2px;">2</sub></dd><dd style="margin-left: 1.6em; margin-bottom: 0.1em; margin-right: 0px;">Na<sub style="line-height: 1; font-size: 11.2px;">2</sub>O + SiO<sub style="line-height: 1; font-size: 11.2px;">2</sub> → Na<sub style="line-height: 1; font-size: 11.2px;">2</sub>SiO<sub style="line-height: 1; font-size: 11.2px;">3</sub></dd></dl><p><br></p>
<!-- -->
]]>
카페 게시글
[실기] 다산교재 이론서
Re:공사 단답 질문 '유리애자를 저온에서 융해하기위해 넣어주는 산화나트륨 화학식에 대한 문제'
몽그랑
추천 0
조회 989
17.10.11 01:37
댓글 3
다음검색
첫댓글 아 대한전기협회에서 일년마다 펴내는 전기연람에는 Na2O라고 되어 있네요 그게 화학식에도 맞고요
2015년도까지는 온라인으로 책내용 볼 수 있으니 4편 5장 애자 찾아보세요
http://www.epic.or.kr/cont/yearbook/elecYearbookList.jsp
아~ 이런 좋은 정보가 있었군요. 알려주셔서 감사합니다. ^^
역시 맞네요 ㅎㅎ 친절한 답변 감사드려요 !!