Questions tagged [equipment]
Questions regarding the equipment used in labs (such as flasks, tubes etc.), their operation and maintenance.
243 questions
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Use of pipette during experiments for determination of oxygen by Winkler's method
We were performing estimation of $\ce{O2}$ by Winkler's method and we were told by the instructor that while adding $\ce{MnSO4}$ and $\ce{NaOH}$ / $\ce{KI}$ the pipette tip should be well below the ...
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Does anyone know what this piece of glassware is?
I recently found this piece of lab glass with a jacket and spout. It says eubilicmeter but I cannot find any information about it online and I do not know what it is supposed to do. It is hollow in ...
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Possible Method for Testing Ammonia (and Nitrite/Nitrate) Concentration in Water
I am designing an automated system testing device for my high school's aquaponics club. We need to test for a number of ion concentrations, including ammonia and nitrite/nitrate. In my research, the ...
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4
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1
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Solvents for tartrates / tannins that won't attack glass
At the bottom of my wine decanter (which due to its shape is fantastically hard to clean mechanically) a layer of reddish brown precipitate forms. I believe this is probably potassium bitartrate ...
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How to judge accuracy and precision of measurement devices?
I am unsure about the accuracy and/or precision of measuring instruments.
For example, if we have a graduated cylinder, a pipette and a beaker, how and why can we assert them that they can be used ...
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Piece of equipment similar to syringe for gas collection
I'm looking for the name of a piece of equipment similar to a syringe. The only difference is that this item is made entirely from glass. The purpose of this equipment is to collect gases.
Here is a ...
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What's the difference between pipettes calibrated "TD", "TC", "Blow-out" and related terms?
I've never blown-out the last drop of any glass pipette I've ever used during my undergraduate studies. Recently I re-read some notes I had lying around in order to prepare a class I had to give to a ...
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What is this "bulbous"/"blood sugar" test tube used for?
I was at an antique and bric-a-brac store, and I found several pieces of glassware. They were pretty cheap, so I purchased some of the more interesting ones. Among them were a few somewhat strange "...
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Unknown glassware
I recently found a piece of older glassware in our lab and nobody seems to know what it is. It appears to be some sort of condenser; however, it does not have both the in and out little notches on it.
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Automated chemistry test machines? What is currently done, and what is research leaning towards?
There are small and large chips and machines to effect admixtures,blends, fusions of different chemicals into a variety of test samples, and there are machines to measure many vials of all kinds of ...
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Kipp's apparatus with powders
A Kipp's apparatus has three distinct bulbs. The topmost one contains a liquid and a tube to the bottommost one. The middle one contains a solid to react with the liquid.
This is very understandable ...
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Is there a way to counteract the problems with weighing hot objects?
I am currently performing an experiment in which it would be greatly beneficial to be able to accurately measure the mass of a hot object without waiting for it to cool. The current plan is simply to ...
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Condensation of Ethylene Glycol
I'm looking to reflux a 250 mL of ethylene glycol solution. Would an Allihn condenser be suitable; if so what length?
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Is this Boiling point apparatus?
I have some chemistry equipment but I am not sure what it is for; I think it may be apparatus for measuring elevated boiling points. I have included a drawing of how I think it should go together. ...
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Why does KCl come in amber coloured bottles?
I remember from school that photosensitive chemicals are kept in amber coloured bottles. Is KCl photosensitive? I read up the impurities list on the bottle and it says that it may have bromides too? ...
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Preparing an inert atmosphere reaction vessel with only an input?
One time, the graduate student that I work with was showing me how to prepare an inert atmosphere in a double necked round bottom flask. After drying it in the oven, she used a torch to drive out all ...
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How to read the used volume from a burette?
I conducted an acid-base titration with vinegar and sodium hydroxide today, where sodium hydroxide was used as the titrant (solution in the burette). I collected the data for the initial and final ...
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Wetting properties of FTO coated glass
I am trying to spin coat a layer of polymer+Quantum Dots on an FTO coated glass slide. My material is forming agglomerates at the edges of my slide. My polymer is PVK which has a conc of$\approx 4.5mg/...
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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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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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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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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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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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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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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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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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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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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, "...
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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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4
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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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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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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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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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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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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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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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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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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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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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4
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2
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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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1
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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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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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4
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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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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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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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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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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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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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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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