Conditions at which the reaction takes place have been studied using unfiltered light obtained from a Hanovia immersion lamp, and the effects of nitrate concentration, pH, and radiation intensity, were evaluated at 25°C. The experiment is also part of the Royal Society of Chemistry’s Continuing Professional Development course: Chemistry for non-specialists, How a warehouse of ammonium nitrate destroyed a capital city, Teach the extinguishing properties and density of CO₂ safely, Prepare students to use their learning in different situations, The toxic ingredient lurking in green vegetables, oxalic acid is familiar to Advanced Higher students for other reasons. If lesson time is limited, the writing of the message and the drying process could be carried out before the demonstration begins. By using this site, you agree to its use of cookies. SODIUM NITRATE NaNO3. The thermal decomposition of sodium nitrate and the effects of several oxides, such as silica, titania, zirconia, alumina, and magnesia, on the decomposition were studied up to 900 °C by means of the … I. Copyright © 1968 Published by Elsevier Ltd. Journal of Inorganic and Nuclear Chemistry, https://doi.org/10.1016/0022-1902(68)80292-1. By continuing you agree to the use of cookies. Ultra-violet radiation of wavelengths shorter than 3300 Å, obtained from a high-pressure mercury lamp, causes photolysis of sodium nitrate to occur in aqueous solutions; evolution of gaseous oxygen occurs together with formation of nitrite and, at higher pH values, of pernitrite. Show Policy, Bulletin of the Chemical Society of Japan, PDF Make a saturated solution of sodium nitrate by adding about 10 g of solid to 10 cm3 of water and stirring. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. White, hygroscopic. The force of the ammonium nitrate … 9) and also the influence of radiation intensity on the rates of nitrite formation (Fig. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Decomposition of sodium nitrate solutions under ultra-violet irradiation at 25°C. Our journal website uses cookies to support your experience . formula when Sodium nitrate decomposes upon heating to form sodium nitrite and oxygen gas.? Read our standard health & safety guidance. Balancing chemical equations. The thermal decomposition of sodium nitrite to produce sodium nitrate, sodium oxide and nitrogen. It could be a student activity, but with a large class it will need a well-ventilated laboratory . As you go down the Group, the decomposition gets more difficult, and you have to use higher temperatures. The demonstrationa Using a small paintbrush (or a length of wooden splint), write a message on the absorbent paper. The effects of these oxides on the thermal decomposition of sodium nitrate could be interpreted by the relative scale of the acidity of oxides. Applying practical knowledge to unfamiliar contexts, Prepare oxalic acid as a primary standard. Lv 4. The demonstration takes about 10 -15 minutes. 10) is found to be of a different type than that shown in Fig. Practical Chemistry activities accompany Practical Physics and Practical Biology. If a hot-air blower is not available, judicious use of a Bunsen flame or an oven provides an alternative method for drying the paper. d Apply a glowing splint to the start of the message until the treated paper starts to glow and char. Answer Save. Filter or blotting paper sheets – as large as possible, Sodium nitrate(V) (OXIDISING, HARMFUL), about 10 g. Refer to Health & Safety and Technical notes section below for additional information. The message will be virtually invisible, so mark the start of it with a light pencil mark. 4 years ago. The gases formed were O2, NO, and N2, the formation of N2 being detected above 680 °C The thermal decomposition of sodium nitrate was supposed to consist of the following three successive or concurrent reaction processes, according to the degree of the reaction: (I) the decomposition of sodium nitrate to nitrite and oxygen, (II) the first-order liquid-phase reaction, with some kind of quantitative relationship between nitrate and nitrite, and (III) the formation reaction of sodium oxide, expressed by the Avrami-Erofe’ef equation. Melts without decomposition, on further heating decomposes. This site uses cookies from Google and other third parties to deliver its services, to personalise adverts and to analyse traffic. Note: The more modern name for sodium nitrite is sodium nitrate(III). chemistry. Please login to view your saved searches. Unlike the case of pernitrite, the formation of nitrite is reduced when concentrations of nitrate increase (Fig. The thermal decomposition of sodium nitrate started at about 450 °C. Resources for careers related activities, STEM club activities and support for longer projects. With older students, the demonstration could be used to revise the equations for the decomposition of nitrates. Readily soluble in water … Ask your 16–18 students to take a closer look at ammonium nitrate and enthalpy, The physics of restoration and conservation. (1006K), The Solution Chemistry of Organotin Compounds. e Remove the splint and watch as the glow and charring work their way along the message, leaving the untreated paper untouched. Resources used by some of the activity providers for outreach work as part of the Chemistry for All project. Heating also poses a danger: ammonium nitrate decomposes at around 230˚C, and can explode when heated to between 260–300˚C if it’s confined. Applying a glowing splint to the start of the message makes the treated paper smolder and the message is revealed as the glow spreads its way through the treated paper. © Nuffield Foundation and the Royal Society of Chemistry. In this particular case, sodium nitrate decomposes to give sodium nitrite (sodium nitrate(III)) and oxygen, and it is the oxygen released which helps to promote the burning process and produce the glow and charring: Most other nitrates will also produce a similar effect, but potassium nitrate is less effective because it is less soluble and some other nitrates may give off very toxic nitrogen dioxide when they decompose. This experiment could be used to introduce the fire triangle: fuel, oxygen and energy. Chemical reaction. 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