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استفاده از وسایل آزمایشگاه

نوشته شده توسط:رضا کریمی
جمعه 21 خرداد 1389-09:07 ب.ظ

بشر و ارلن :

مانند لوله ی آزمایش سطح داخلی بشر و ارلن را باید با برس لوله شست سپس آب کشید و سطح بیرونی آنها را با دستمال تمیز خشک کرد . برای خشک کردن سطح داخلی بشر یا ارلن ( در صورت لزوم ) آنها را مطابق شکل روی سه پایه و توری باید گذاشت و با چرخاندن شعله چراغ گاز به اطراف ظرف از طرف بیرون داخل آن را خشک کرد.

به شکل توجه کنید :

1- بشر : برای گرم کردن محلولها و مایعات در سنجشهایی حجمی ( مثلا سنجش اسید و باز  ) به کار می رود از نوع مدرج آن می توان برای برداشتن حجم معین و یا تعیین حجم محلولها و یا مایعات ( البته به طور تقریبی ) استفاده می شود .

2- چراغ گاز آزمایشگاه ( چراغ بنزن ) : وسیله ای فلزی گاز سوز است که برای گرما دادن به مواد و غیره در آزمایشگاه کاربرد دارد .

3- سه پایه ی فلزی : وسیله ای فلزی است که برای نگهداشتن وسایل و گرم کردن آنها در بالای شعله ی چراغ گاز آزمایشگاه کاربرد دارد .

 

 

بالن با لوله جانبی ( یا بالن تقطیر ) :

مانند بشر یا ارلن باید آن را با لوله شوی ( برس لوله ) شست سپس آب کشید و بیرون آن را با دستمال تمیز خشک کرد . برای خشک کردن داخل آن بهتر است بالن را مطابق شکل با گیره ی مخصوص بالن به میله ی پایه بست و با چرخاندن شعله ی چراغ گاز در اطراف سطح خارجی داخل آن را خشک کرد .

بنابراین ابزار شیشه ای قابل گرما دادن عبارت است از : لوله آزمایش ، بشر ، ارلن و بالن تقطیر و بالن ته گرد و سایر ابزار شیشه ای مانند ابزار اندازه گیری حجم و دماسنج و غیره را نباید مستقیما روی شعله ی چراغ گاز قرار داد .

ابزار شیشه ای که برای برداشتن مایعات یا حجم معین به کار می روند عبارتند از بورت ، پیپت ، استوانه مدرج ، بالن پیمانه ای ( بالن حجمی ) ، بشر مدر ، گیلاس مدرج .

به شکل توجه کنید :

1- بالن تقطیر : وسیله ای مخصوص تقطیر است ( می توان به جای ارلن تخلیه از آن استفاده کرد البته شکننده تر از ارلن تخلیه است )

2- گیره ی بالن : وسیله ای فلزی که برای نگهداشتن بالن ، ارلن و.... به کمک شاخک و پایه کاربرد دارد.

3- میله و پایه ی فلزی : برای نگهداشتن وسایلی مانند بورت ، بالن و به طور کلی سوار کردن دستگاههای مختلف ( به کمک گیره ) به کار
می رود

 



بورت :

بورت را هم مانند سایر ابزار شیشه ای باید شیت آب کشید و خشک کرد . برای شستن بورت باید آن را به کمک گیره ی مخصوص بورت به میله ی پایه ای بست و در آن ارلنی گذاشت . سپس با آبفشان کم کم در بورت آب ریخته و آن را خالی کرد ضمن این عمل باید سعی کرد که آب ریخته شده هم جای سطح داخلی بورت را بشویید و نیز باید صبر کرد تا آب ریخته شده کاملا از بورت خارج شود .



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