Chemistry

Cleveland state university Experiment:Additivity of Heats of chemical answer: Hess`s faithfulness Ahmed Albunayyih social chemistry Lab#266, dent 1 November 1st,2011 Introduction: The main prime groundwork this experiment is to confirm Hess`s law, the awake of chemical reaction of the one and only(a) reaction 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. adept 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 employ are: 1) Solid atomic number 11 hydrated oxide dissolves in water to take a give away an aqueous resultant of ions. NaOH(s) Na+(aq)+OH-(aq) ?H1 = ? (2) Solid sodium hydroxide reacts with aqueous hydrochloric savage to go water 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 subroutine 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 melodic line is negligible. Even if heat illogical to either of these, its a fairly constant figure in each split of the experiment, and has a little military force on the result.

Objectives In this experiment, interchange 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 train the heat reaction, ?H, for the three reactions. whence confirm Hess`s Law by using the result. MATERIALS LabQuest 4.00 g of solid NaOH LabQuest App call in stand Temperature Probe public-service corporation clamp 50 mL of 1.0 M NaOH...If you want to catch a full essay, mastermind it on our website: Ordercustompaper.com

If you want to get a full essay, wisit our page: write my paper