Questions tagged [equipment]

Questions regarding the equipment used in labs (such as flasks, tubes etc.), their operation and maintenance.

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44 views

How do I open volumetric flask with with 1M HCl? [duplicate]

I have two volumetric flasks with ground glass stopper, and I have 1M HCl inside each of them. I can't open either, stopper is "glued" to the flask somehow. Potentially by hydrochloric acid. Or maybe ...
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2answers
141 views

Can anyone identify this glassware?

Hoping for a little help identifying this lab glass , I don't know anything about lab glass , this was in a storage unit I'm purchased at auction,,, there is what I think is called a condense & 2 ...
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1answer
210 views

Trifluoroacetic acid, Formic acid and dichloromethane

I am working in a small lab (in a small company) with very poor conditions, which I have to improve (for example: no sink , I have to wash the glassware in the bathroom). My organic chemistry is very ...
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1answer
106 views

How to store bulk gas products and reagents?

Suppose I'm doing a batch process where an intermediate (non-hazardous) reagent is a gas, and I need to produce and temporarily store something on the order of a cubic meter of it to later feed back ...
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2answers
6k views

Boiling and Exploding Beaker?

A few days ago, I was creating a solution which involved boiling water. I had two 4L beakers on identical hot plates. After around 10 minutes, the first one boiled. Waiting another 30 minutes, the ...
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1answer
1k views

Why are Erlenmeyer flasks shaped the way they are?

The title says it all. We could conceive a good number of other possibilities. Why did Erlenmeyer arrive at this design?
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1answer
97 views

High temperature bath chemicals

I have an electric mantle that I want to bathe reaction vessels at temperatures up to $\mathrm{750^{\circ}C}$. Obviously that rules out oils. What substances are used as bath media at such ...
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2answers
3k views

Choosing a vacuum pump for fractional distillation

I have a fractional distillation setup. I would like to purify a small mixture ($\pu{\approx 100-150 mL}$) of high boiling point compounds (between $200$ and $\pu{300^\circ C}$). The one that ...
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3answers
227 views

What are good lubricants for Bunsen burners?

We've been running into a lot of problems the last several years with our laboratory Bunsen burners becoming jammed and/or corroded. I've just come to find out that our lab tech has been lubricating ...
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1answer
275 views

Autoclaving certain plastics?

My professor is letting me use the autoclave in the future, but I am a novice. I asked him what materials were safe to autoclave for my notes, materials meaning glass or plastic-ware. He stated, "It ...
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113 views

How to test acid-base reactions under pressure?

I am trying to test chemical reactions, more specifically reactions between an acid and a base, at different levels of pressure. I would like to know if there is some kind of equipment I can get that ...
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1answer
54 views

Refrigeration for Cryochemistry −35 °C

I need to cool a tube containing liquid to −35 °C for a cold chemical experiment that will last about a week. The glass vessel I need cooled is 500 mL in volume and will be giving off $\ce{H2S}$ gas. ...
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2answers
129 views

What is this glassware?

I found this in a second hand store, and I think it has to do with freeze drying. Is there any validity to this assumption? What is this called? Also, the little tuberculina at the bottom are stuffed ...
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1answer
72 views

opperating a distillation column far from flooding

I know that flooding will ruin the performance of a distillation column. There are many correlations (Eckert, kister, billet, etc.) that will tell you when a column will flood based on your fluid ...
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88 views

Bromine Homolysis Using Handheld UV Lamp

I'm trying to investigate the homolysis of bromine for an IB Chemistry (high school) Internal Assessment. To do so, I need a UV lamp capable of splitting diatomic bromine into bromine radicals. Would ...
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2answers
5k views

What is the accuracy of medical syringes?

I am interested in both low and high volume syringes.
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157 views

Why does my eudiometer have this excess volume at the top?

It looks like this: The measurements start at 2 mL and the volume remaining in the top seems to be greater than 1 mL. What is the purpose? I am trying to measure hydrogen gas.
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1answer
182 views

Types of argon gas regulator? [closed]

I have a high pressure bottle of argon gas (99.98 %) that I need to use in an experiment. The problem is that the regulator I have is a generic type that is seemingly optimized for high flow rates (...
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1answer
183 views

Why does latex tubing become white and brittle over time, especially where it's bent?

Here's a picture of some latex tubing we have in the lab, bought many years ago and stored in a drawer. What's responsible for the white corners near places where the tubing is bent? Is this ...
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2answers
941 views

What is this Lab equipment?

I want to know the name of this equipment with a sealed graduated tube and the purpose it's being used. I went through all the results of Google, but I was unable to find this exact equipment. I ...
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1answer
338 views

What is this piece of glassware called?

Here's an image: The left side is designed to be fitted into a beaker, and it captures gas evolved during a reaction. The right side can be filled with a liquid to then react with that gas. We use ...
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1answer
374 views

The weight of a 2cc glass pharmaceutical flame sealed ampoule? [closed]

This is one of the flame sealed type whose neck is broken before use. There seems to be lots of info on dimensions but none with regard to weight.
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2answers
292 views

Name of round piece of glassware with thin neck?

Found in the lab, it looks like a round bottom flask with an extremely thin neck. Effectively a glass sphere about 60 mm in diameter with what looks like a capillary tube as the neck. Not sure whether ...
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1answer
216 views

Why laboratory glassware shatter in big pieces?

What are laboratory glassware made up of? This question came up in mind because once I accidentally dropped a test tube and it shattered into big pieces. I observed that it didn't broke into pieces on ...
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1answer
136 views

Best way to remove Aluminium from “silvered” glass?

Requirement is simple(!) - I have 30mm silvered glass balls that are originally Christmas tree decoration that I want to use in a very unconventional manner in a physics experiment. As far as I can ...
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0answers
59 views

How to minimize surface adsorption by choice of material?

I need to do buoyancy experiments in vapours consisting of organic molecules in air using a microbalance. This involves measuring the change in weight of a sealed glass sphere when exposed to the gas. ...
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2answers
465 views

What equipment to use to make liquid oxygen?

I'd like to do some experiments with liquid oxygen but as a first step I'll have to make some. Unfortunately I don't have any experience designing cryogenic experiments. I'm thinking I'll cool gaseous ...
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2answers
1k views

Using sigfigs when measuring with an instrument with marks other than powers of ten?

If an instrument does have markings that are powers of ten, then finding the precision of the instrument is easy. For example, if a graduated cylinder had markings for every 0.1mL, or every mL, or ...
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1answer
546 views

How to get meniscus down to the calibration mark with a volumetric pipette

I am having trouble taking aliquots using the 10 ml volumetric pipette. After rinsing, I draw the solution up past the calibration mark and stopper the pipette with my index finger. Then I slowly ...
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0answers
69 views

Flow cup viscometer vs rotational viscometer: limitations and use cases for each

What are the limitations of an inexpensive flow cup viscometer (or any other manual test viscometer) when compared to an expensive digital rotational viscometer?
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1answer
961 views

Vacuum distillation apparatus selection and configuration

I want to assemble a "hobbyist-level" vacuum distillation apparatus for extracting small volumes of "typical" solvents (e.g., water, alcohols, ketones, diols). I already have standard lab glassware ...
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0answers
222 views

Why molten lithium burns through the glass but sodium not?

It's well-known in laboratory practice that one shouldn't melt lithium in a glass equipment and there isn't such rule about other alkali metals. You may damage the glass with sodium but lithium will ...
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1answer
92 views

NO2 gas was detected in FTIR

We have a laser chamber full of $\ce{F2}$ gas (no air should be in the chamber) and several parts including steel, wires, ceramics, zinc.... This is for laser generation so the temperature is pretty ...
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3answers
1k views

What angle limits should apply to Graham condensers?

I have seen Graham condensers set at an angle (perhaps as low as 30 degrees from horizontal). I guessed this wouldn't be a problem because siphoning would clear the condensate. But I recently saw an ...
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0answers
321 views

Which are the appropriate washing solvents for gas chromatography equipment? [closed]

I work in a laboratory where gas chromatography is used extensively. We handle terpenes and terpenoids (alcohols, ketones, and acetates derived from terpenes), organic solvents (acetone, acetonitrile, ...
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1answer
864 views

Correct flask for reacting and distilling on hotplate?

I'm running a distillation reaction at under 100 °C with the heat coming from a hotplate (combined with magnetic stirrer). Is a Florence flask the correct vessel to use on the hotplate? Given the ...
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2answers
9k views

Solution for storing a glass electrode

What kind of storage solution is required for a glass electrode? Is 3 M $\ce{KCl}$ sufficient for this purpose? If so, what is the approximate pH of that solution (the solution I use presently has a ...
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5answers
16k views

How to stop goggles from fogging?

I wear corrective eyeglasses, and because of this, I frequently experience problems with fogging when I wear safety goggles. How can I prevent or reduce fogging? The safety goggles I use are the ...
2
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1answer
577 views

Where can I find CAD blocks for lab glassware?

I want to draw a sketch of my apparatus for my report. I am conversant with the AutoCAD drafting software. Where can I download CAD blocks for commonly used labware items (like round bottom flask, ...
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1answer
110 views

Sodium by electrolysis through glass

In his 1926 thesis Robert Cady Burts describes the production of sodium by electrolysis of sodium nitrate through glass. I can't find much else on this method. Are there any modern descriptions of ...
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2answers
1k views

Are PTFE stir bars resistant to all lab solvents?

It seems like glass-coated stir bars are a specialty item. Standard stir bars are coated in PTFE. Is PTFE resistant to all typical lab solvents? Or is there a reference to check to ensure it is ...
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1answer
173 views

How to clean glassware containing pesticide solutions

I have pesticide (dimethoate) dissolved in methanol in volumetric flasks and graduated cylinders. How do I clean this glassware properly before moving on to the next dilution of a different pesticide.
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1answer
161 views

Porous petri dish

I was wondering if there is a type of glass dish with small holes in it to use as a filter. I've found a few but they are either fritted glass disks or a type of funnel. I was looking for something ...
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1answer
392 views

Can I get an accurate temperature reading from a flask with a built-in thermometer well?

I recently purchased a flask with a built in thermometer well, but I have discovered that simply setting a rod thermometer in the well does not produce a very accurate reading. I was wondering if ...
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1answer
623 views

How to attach a liebig condenser to a flask for reflux heating?

I know it's probably a stupid question, but I can not figure this out. I have a liebig condenser that I usually use for distillation with a Kjeldahl bulb, which makes it easy to attach to a flask ...
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1answer
1k views

Household Melting Point Standards

I'd like to accurately calibrate a digital thermometer I'm building in the range of $50^\circ$ to $120^\circ$ Celsius. I'm aware that one can buy various chemicals that have melting points in this ...
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1answer
877 views

Stirring the reaction between hydrochloric acid and a powdered substance

For an experiment, I'm adding several substances (as powders) to hydrochloric acid, and measuring the temperature changes to calculate enthalpy. However when adding the powders, the mixture requires ...
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4answers
714 views

How much does the quality of glassware matter, really?

Discussing about the pros and cons of glassware from different manufacturers for chemistry experiments easily becomes a heated debate. Well, that's how it seems if you read the chemistry related blogs,...
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3answers
7k views

How to remove a stuck stopper from a flask?

How do I remove a stopper that has been stuck in the neck of a 100 mL round bottom flask since I forgot to wipe the neck of the flask. A salt was formed in the 100 mL flask and the stopper ...
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2answers
1k views

Safety in handling of concentrated ammonium fluoride

I recently saw a protocol for extracting organic materials that are bound in the silica matrix formed by diatoms. The extraction protocol used 10 molar ammonium fluoride ($\ce{NH4F}$). I briefly ...