Neutralization replys
In the first part of the conclusion of the enthalpy transmits, neutralization reactions were tested. Neutralization reaction is the combination of an pungent and base solution which produces water and a salt. Being reactions there is also changes in energy.
The obtained suppositional set of ?H where from the battle of the enthalpies times the stoichiometric factors of the products and the reactants. It privy be shown as . For example, in the reaction of NH3 + HCl NH4+ + Cl- , the net ionic equation is NH3 + H+ NH4+, consequently = (1*-132.51 KJ/mol) ((1*-80.29 KJ/mol)+(1*0 KJ/mol)) = -52.22 KJ/mol.
And from them we whoremaster say that the reactions are exothermic.
The experimental values were obtained from manipulating the equations, the heat of reaction is absorbed by the calorimeter, the heat of the calorimeter is play off to the heat capacity of the calorimeter multiplied by the change in temperature of the calorimeter, and lastly that the enthalpy changed can be expressed as the quotient heat of calorimeter and the moles of the pass reactants. The obtained experimental magnitudes were quite far from the theoretical values judging by the percent error, but we can see that their signs are the same, pertaining that the reaction is exothermic as predicted. This can be shown as .
In the experimental enthalpy change for the same reaction above, the heat capacity of the performing root was used and their recorded change in temp, also the limiting reactant was determined analytically thus -48.58KJ/mol.
The percent error was careful from the equation is * 100%, in the sample, *100% = -6.97%.
Reactions between an fighting(a) metal and an acid.
In these kinds of reactions, the active metal will be dissolved in the acid and formation of hydrogen gas. thither is also change in energy.
The theoretical values of ?H is the same in the neutralization reaction, . In the first reaction 2HCl + Mg MgCl2 + H2, having...If you want to get a full essay, ball club it on our website: Orderessay
If you want to get a full essay, wisit our page: write my essay .
No comments:
Post a Comment