Kevin When collecting gas by the displacement method—commonly used for gases that are insoluble or only slightly soluble in water—you typically need a gas jar that is placed inverted in water, as shown in the setup above. This arrangement allows the gas from the delivery tube to rise and displace the water inside the jar. To … Read more
Many chemistry experiments involve the release of gases. While some gases can be safely vented through fume hoods or into well-ventilated areas, there are situations where certain gases need to be collected. In such cases, gas jars are used. The primary role of a gas jar in the laboratory, therefore, is to collect and temporarily … Read more
When working in closed systems where pressure changes can cause problems, the most suitable laboratory equipment for adding controlled amounts of liquid to a reaction flask is not a standard dropping funnel, but a pressure-equalizing dropping funnel (also called a dropping funnel with pressure-equalizing capabilities). As shown in the diagram above, a pressure-equalizing dropping funnel … Read more
Many students get confused when they are asked to use a laboratory squeeze bottle in their experiments. They often think it is a completely different piece of equipment from the wash bottle they already know. In reality, laboratory squeeze bottles and wash bottles are the same type of container—just known by different names. The term … Read more
What is a Conical Flask? A conical flask, also known as an Erlenmeyer flask, is a type of laboratory glassware with a wide, flat base that tapers into a narrow neck. This flask is widely used in chemistry and biology laboratories for mixing solutions, heating liquids, titrations, and culturing microorganisms. Main Features The conical flask … Read more
What is a Pneumatic Trough? A pneumatic trough is a laboratory container used for collecting gases that are insoluble or only slightly soluble in water, such as oxygen, hydrogen, or nitrogen. It is typically made of glass, metal, or plastic and is filled with water to facilitate gas collection. The principle behind the pneumatic trough … Read more
What is a Test Tube Brush? A test tube brush is a laboratory cleaning tool specifically designed to clean the inside of test tubes and other narrow glassware. It consists of a long, flexible handle (usually made of plastic or metal) with soft bristles at the end. These bristles help scrub away residues, chemical deposits, … Read more