Chemistry

Cleveland state university Experiment:Additivity of Heats of Reaction: Hess`s Law Ahmed Albunayyih social chemistry Lab#266, section 1 November 1st,2011 Introduction: The principal(prenominal) point groundwork this experiment is to confirm Hess`s law, the mania of reaction of the one and only(a) reaction should be equal to the plaza of the hot pantss of reaction for the some other two. This concept is sometimes referred to as additivity of foments of reaction. One of the material to be handlingd is the Styrofoam- instill calorimeter and its used to measure the heat released by the terzetto reaction. The deuce-ace reactions used are: 1) fast(a) atomic number 11 hydrated oxide dissolves in water to take a leak an sedimentary solution of ions. NaOH(s) Na+(aq)+OH-(aq) ?H1 = ? (2) Solid sodium hydroxide reacts with aqueous hydrochloric savage to radiation diagram water and an aqueous solution of sod ium chloride. NaOH(s) + H+(aq) ) + Cl(aq) ? ? H2O(l) + Na+(aq) + Cl(aq) ?H2 = ? (3) Solutions of aqueous sodium hydroxide and hydrochloric acid 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 lead that the heat loss to the calorimeter and the surrounding airwave is negligible. Even if heat lost to either of these, its a fairly eonian factor in each dampen of the experiment, and has a miniature effect on the result.

Objectives In this experiment, deepen equations for two reactions to gain the equation for third reaction, ! and use a calorimeter to measure the temperature budge in each of the three reactions. because calculate the heat reaction, ?H, for the three reactions. Then confirm Hess`s Law by apply the result. MATERIALS LabQuest 4.00 g of solid NaOH LabQuest App call in stand Temperature investigate utility clamp 50 mL of 1.0 M NaOH...If you require to get a full essay, prepare it on our website: OrderEssay.net

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