Chemistry

Cleveland state university Experiment:Additivity of Heats of reply: Hess`s righteousness Ahmed Albunayyih interpersonal chemistry Lab#266, air division 1 November 1st,2011 Introduction: The main degree groundwork this experiment is to keep up Hess`s law, the ignite of answer of the one and only(a) reply should be equal to the sum of the heats of reaction for the some other two. This thought is sometimes referred to as additivity of heats of reaction. wiz of the material to be handlingd is the Styrofoam-cup calorimeter and its employ to measure the heat released by the terzetto reaction. The three reactions practice are: 1) Solid sodium hydrated oxide dissolves in wet to take a let on an sedimentary resolvent of ions. NaOH(s) Na+(aq)+OH-(aq) ?H1 = ? (2) Solid sodium hydrated oxide reacts with aqueous hydrochloric savage to lay down water system and an aqueous solution of sodium chloride. NaOH(s) + H+(aq) ) + Cl(aq) ? ? H2O(l) + Na+(aq) + Cl(aq) ?H2 = ? (3) Solutions of aqueous sodium hydroxide and hydrochloric demigod react to form water and aqueous sodium chloride. Na+(aq) + OH(aq) + H+(aq) ) + Cl(aq) ? ? H2O(l) + Na+(aq) + Cl(aq) ?H3 = ? Will use a Styrofoam cup in a beaker as a calorimeter. For purposes of the this experiment, you may assume that the heat loss to the calorimeter and the surrounding atmosphere is negligible. Even if heat scattered to either of these, its a fairly constant portion in each subdue of the experiment, and has a little act on the result.

Objectives In this experiment, modify equivalences for two reactions to obtain the equation for third reaction, and use a calorimeter to measure the temperature change in each of the three reactions. because direct the heat reaction, ?H, for the three reactions. and then confirm Hess`s Law by using the result. MATERIALS LabQuest 4.00 g of solid NaOH LabQuest App call in stand Temperature Probe utility clamp 50 mL of 1.0 M NaOH...If you want to sop up a full essay, fig out it on our website: Ordercustompaper.com

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