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		</table><h1 style="margin-bottom:10px;padding-top:5px;" align="left">Chemikalien</h1><div style="clear:both;"><img src="https://old.frits.dk/img/pixel.gif" width="378" height="1" ></div><p><strong>Salpeters&auml;ure</strong> <img align="right" style="float: right;" src="../img/tips/chemicals.jpg" alt="" width="100" height="100" /></p>
<p>Salpeters&auml;ure gibt es in einzelnen F&auml;llen&nbsp;in konzentriertem Zustand, wird aber meistens mit dem gleichen Volumen Wasser verd&uuml;nnt. Diese S&auml;ure ( bezeichnet mit 1:1) l&ouml;st verschiedene Metall, unter anderem Silber, Kupfer, Nickel, Blei und Quecksilber, jedoch kein Zinn, mit dem die S&auml;ure stattdessen&nbsp;unaufl&ouml;sliche Zinns&auml;ure bildet. Gold und Platin werden nicht von Salpeters&auml;ure angegriffen, jedoch k&ouml;nnen diese Metalle in K&ouml;nigswasser aufgel&ouml;st werden, welches eine Mischung aus einem Teil Salpeters&auml;ure und zwei bis vier Teilen&nbsp;Salzs&auml;ure&nbsp;ist. &nbsp;</p>
<p><strong>Salzs&auml;ure</strong></p>
<p>Salzs&auml;ure wirkt aufl&ouml;send mit&nbsp;vielen Metallen, wie bspw. Zinn und Aluminium.&nbsp;Diese Eigenschaft ist&nbsp;von besonderem Interesse bei der Arbeit mit Zink, da die S&auml;ure oft daf&uuml;r&nbsp;verwendet wird,&nbsp;um Zink aus einer Mischung aus edlem Metall und Zinkpulver zu entfernen.</p>
<p><strong>Schwefels&auml;ure</strong></p>
<p>Schwefels&auml;ure in konzentriertem Zustand kann Silber und viele&nbsp;unedle Metalle aufl&ouml;sen. In verd&uuml;nnter Form entfernt sie unedle Metalloxide, wie bspw. Kupferoxid, von der Oberfl&auml;che abgek&uuml;hlter Metalllegierungen und wird daher als ein wichtiges Beizmittel&nbsp;verwendet.</p>
<p><strong>Bors&auml;ure</strong></p>
<p>Bors&auml;ure, welche die Form wei&szlig;er Kristallpl&auml;ttchen hat, erkennt man leicht daran, dass es sich schmierig auf der Haut anf&uuml;hlt, wenn man es zwischen den Fingern verreibt. Diese S&auml;ure verdampft erst bei sehr hohen Temperaturen und hat daher die Eigentschaft den Glanz von Gegenst&auml;nden, die mit Bors&auml;ure &uuml;berzogen sind, selbst nach dem Erhitzen und L&ouml;ten zu bewahren.</p>
<p><strong>Borax</strong></p>
<p>Borax/ Natriumborat hat im geschmolzenen Zustand eine stark aufl&ouml;sende Wirkung auf die meisten Oxidverbindungen unedler Metalle.&nbsp;Daher&nbsp;ist&nbsp;Borax ein wichtiges Hilfsmittel bei vielen Arten des Hartl&ouml;tens, da das schmelzende Salz das Metall an der L&ouml;tstelle rein h&auml;lt. <br />Beim Schmelzen von edlem, legiertem Metall in Grafit oder Stein, wird Borax verwendet, um die Metalloberfl&auml;che zu sch&uuml;tzen.</p>
<p><strong>Soda</strong></p>
<p>Soda oder Natriumcarbonat ist ein Salz, welches bei der Reaktion von Kohlens&auml;ure und Natrium entsteht. Es hat die chemische Formel <span style="font-size: 8.5pt; line-height: 115%; font-family: Tahoma, sans-serif; color: #252525; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Na<sub>2</sub>CO<sub>3</sub></span>.</p>
<p><span style="font-size: 8.5pt; line-height: 115%; font-family: Tahoma, sans-serif; color: #252525; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Die gew&ouml;hnliche Soda tritt in Form klarer Kristalle auf, welche dann Kristallsoda genannt wird. Zudem wird Soda oft als calzinierte Soda verkauft. Diese ist drei Mal st&auml;rker als gew&ouml;hnliche Soda und&nbsp;wird gebildet, indem man Natron erhitzt, wobei sich Wasser und Kohlendioxid abspalten: </span></p>
<p><span style="font-size: 8.5pt; line-height: 115%; font-family: Tahoma, sans-serif; color: #252525; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span style="background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><span style="color: #252525;">2 NaHCO<sub>3</sub></span><span style="color: #252525;">&nbsp;</span></span><span style="font-size: 8.5pt; line-height: 115%; font-family: Arial, sans-serif; color: #252525; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">&rarr;<span style="font-size: 8.5pt; line-height: 115%; font-family: Tahoma, sans-serif; color: #252525; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"> Na</span><sub>2</sub>CO<sub>3</sub>&nbsp;+ H<sub>2</sub>O + CO<sub>2</sub></span><br /></span></p>
<p><span style="font-size: 8.5pt; line-height: 115%; font-family: Tahoma, sans-serif; color: #252525; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Soda darf nicht mit kaustischer Soda (Natriumhydroxid), welches eine stark &auml;tzende Base ist, verwechselt werden.</span></p>
<p><span style="font-size: 8.5pt; line-height: 115%; font-family: Tahoma, sans-serif; color: #252525; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Quelle: Wikipedia (d&auml;nische Seite)</span></p>
<p><strong>Salpeter</strong></p>
<p>Salpeter (Kaliumnitrat) wird als Zusatz beim Schmelzen von unreinem Abfall (bspw. F&uuml;llingen) verwendet.</p>
<p><strong>Salmiak </strong></p>
<p>Salmiak (Chlorammonium, Amoniumchlorid) ist ein F&auml;llungsmittel f&uuml;r Platin in L&ouml;sungen und wird auch bei L&ouml;tarbeiten benutzt.</p>
<p><strong>Zyankali </strong></p>
<p>Zyankalium (Kaliumcyanid), welches unter anderem bei der Versilberung und Vergoldung Anwendung findet, ist eines der gef&auml;hrlichsten Gifte (t&ouml;dliche Dosis sind 0,05g) und darf nicht nur nicht in den Mund oder die Blutbahn gelangen, sondern ist auch beim Einatmen gef&auml;hrlich: Bei dem Dampf handelt es sich n&auml;mlich um Zyanwasserstoff (Blaus&auml;ure), das vom Zyankali abgegeben wird, sobald es mit einer anderen S&auml;ure, wie bspw. Kohlenstoffdioxid, welches sich in der Luft befindet, in Ber&uuml;hrung kommt. Schon ganz geringe Mengen davon k&ouml;nnen nicht nur &auml;u&szlig;erst heftige &Uuml;belkeit und Schwindel hervorrufen, sondern im schlimmsten Fall sogar lebensgef&auml;hrlich sein.</p>
<p><strong>Kochsalz</strong></p>
<p>Kochsalz (Natriumchlorid)&nbsp;wird&nbsp;unterschiedlich angewendet, bspw. als F&auml;llungsmittel f&uuml;r Silber und als Zusatz zu gewissen Schmelzungen.</p>
<p><strong>Bimstein &amp;&nbsp;Wiener Kalk<br /></strong></p>
<p>Bimstein und Wiener Kalk, sowie nat&uuml;rliches und k&uuml;nstliches H&auml;matit werden als Schleif- und Poliermittel verwendet.</p><div style="clear:both;"><img src="https://old.frits.dk/img/pixel.gif" width="378" height="1" ></div>
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