CHEMISTRY GLOSSARY
deionised water → deionizirana voda
Deionised water is water from which ionic salts have been removed by ion-exchange. It is used for many purposes as an alternative to distilled water.
| Type of water | Conductivity / µScm-1 |
|---|---|
| Ultrapure water | 0.05 |
| Distilled water | 0.5 |
| Tap water | 50 |
| Ocean water | 50 000 |
desiccator → eksikator
Desiccator is a glass container with dry atmosphere due to the presence of some dehydrating agent. It is used for protecting the samples, reagents or precipitates from humidity. As dehydrating agent usually waterless calcium chloride (CaCl2) is used.
Dewar flask → Dewarova posuda
Dewar flask or vacuum bottle is a container for storing hot or cold substances. It consists of two flasks, one placed inside the other, with a vacuum between. The vacuum prevents the conduction of heat from one flask to the other. For greater efficiency the flasks are silvered to reflect heat. The substance to be kept hot or cold, e.g., liquid air, is contained in the inner flask. The flask is named after British chemist and physicist Sir James Dewar (1842-1923). Dewar invented the Dewar flask in 1892 to aid him in his work with liquid gases. The common thermos bottle is an adaptation of the Dewar flask.
differential thermal analysis → diferencijalna termalna analiza
Differential thermal analysis (DTA) is a technique that is often used to analyze materials that react or decompose at higher temperatures. The difference in temperature between the sample and an inert reference material is monitored as both are heated in a furnace. Phase transitions and chemical reactions taking place in the sample on heating cause the temperature difference to become larger, at temperatures that are characteristic of the sample.
PCl5 reaction → reakcija s PCl5
Reaction with phosphorus pentachloride (PCl5) is a characteristic of organic compounds containing a hydroxyl group and this reaction is used to identify these compounds in an organic analysis.
dropping mercury electrode → kapajuća živina elektroda
Dropping mercury electrode (DME) is a working electrode arrangement for polarography in which mercury continuously drops from a reservoir through a capillary tube (internal diameter 0.03 - 0.05 mm) into the solution. The optimum interval between drops for most analyses is between 2 and 5 s. The unique advantage to the use of the DME is that the constant renewal of the electrode surface, exposed to the test solution, eliminates the effects of electrode poisoning.
Citing this page:
Generalic, Eni. "Zemljina kora." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
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