with the OH- ions from the base. H+(aq) + OH-(aq) H2O(l) When a weak acid is neutralised some of the energy is needed to dissociate the molecules to make the hydrogen ions available for neutralisation. The result is a value for neutralisation enthalpy lower than - 57 kJ/mol (numerically lower‚ not more negative!) Note that as the weak acid is in equilibrium as the hydrogen ions are ’mopped up’ by the base the equilibrium shifts to the right hand side to make more until eventually all of the
Premium Hydrogen Acid PH
(AMD) problems are the most important environmental problems in sulphide mines especially mines which contain pyrite. Oxidation of sulphides in contact with air and water produces sulphuric acid which reduces the pH of water. The result of these reactions is increase in the solubility of heavy metals and consequently pollution of water resources. The Sarcheshmeh copper mine is one of the largest porphyry copper mines in the world which is located in south-eastern Iran. Chemical analysis of over than
Premium Mining Water Hydrology
------------------------------------------------- ABSTRACT ------------------------------------------------- The copper reaction experiment was demonstrated by adding the reagents like 16M HNO3‚ Distilled water‚ 6M NaOH‚ 6M H2SO4‚ Acetone‚ Zinc metal and Methanol into the beaker with the copper wire. The experiment was also demonstrated to observe how copper reacts while different reagents were being added. It was also demonstrated to practice the common laboratory techniques such as methods
Premium Stoichiometry Chemical reaction Chemistry
AP Chem Exam - ‘98 1. Solve the following problem related to the solubility equilibria of some metal hydroxides in aqueous solution. (a) The solubility of Cu(OH)2(s) is 1.72 x10–6 g/100. mL of solution at 25° C. (i) Write the balanced chemical equation for the dissociation of Cu(OH)2(s) in aqueous solution. Cu(OH)2 Cu 2+ + 2 OH – (ii) Calculate the solubility (in mol/L) of Cu(OH)2 at 25 °C. (1.72 x10–6 g/0.100 L)(1 mol/97.5 g) = 1.76 x10–7 mol/L (iii) Calculate
Premium Chemical reaction Chemistry Acid
REACTION PAPER on GOD IS DEAD The lines‚ “God is dead. God remains dead. And we have killed him‚” can be true in literal sense. Subjectively‚ the lines presented are very agnostic and atheistic. Those are against my will and belief as a Roman Catholic faithful. The three shorter mentioned lines are three important points to be clarified about. The first line says‚ God is dead is true in literal sense. In the Scriptures‚ it written that Jesus became man and so he died as a human. Yes‚ I believe
Premium Pope Benedict XVI Pope Human
the value of the sum for Reaction 1 and Reaction 2’s change in temperature‚ compared to Reaction 3’s change in temperature. Reaction 1 was the dissolution of solid sodium hydroxide in water with a ΔH°rxn of -47047 J/mol‚ Reaction 2 was the neutralization of liquid sodium hydroxide with HCl with a ΔH°rxn of -31289 J/mol and Reaction 3 was the dissolution and neutralization of solid NaOH with HCl with a ΔH°rxn of -91000 J/mol. Consequently‚ the sum of Reaction 1 and Reaction 2 was -78336 J/mol‚ similar
Premium Chemical reaction Chemistry Chlorine
Joe Ross Reaction Paper Adult Development PSY6300 Instructor: Pamela Smilo PhD June 27‚ 2010 Reaction Paper Our textbook The Journey of Adulthood by Barbara R. Bjorklund and Helen L. Bee is the study of adult development‚ and it follows the tenets of developmental psychology‚ the field of study that deals with the behavior‚ thoughts and emotions of individuals as they go through various parts of the life span. The field also
Premium Developmental psychology Erik Erikson Health
In the lab testing the heat of a reaction to understand changes in enthalpy in an exothermic reaction‚ the group hypothesized that if the amount of reactant is changed then the amount of heat produced (exothermic) will increase. This hypothesis was supported through the data as each of the six trials produced heat and the larger the piece of magnesium the larger the change in heat was. In the first trial the group had .085 grams of Mg and after being placed in 3 ml of 21.8℃ HCl the temperature of
Premium Thermodynamics Chemical reaction Energy
Reaction Paper According to the film‚ it seems that the U.S influence in a lot of different ways. They influence us in terms of speech‚ sense of style and clothing‚ food we eat‚ the movies we watch and even how we think and decide. Our government does not give attention in our education‚ from colonial education to neo education means to maintain the control of U.S in our education. They want us learn based only on their books‚ they are making the young ones like robotic children “don’t ask
Premium Sacrifice Education Philippines
11 April 2013 Profesor Maria Duarte Reaction Paper 3.The national agenda of Porfirio Díaz oriented Mexican economy toward exportation and growth‚ how did Díaz’s modernizing agenda affected elite and lower-classes in the process? Porfirio Diaz was known as a ruthless revolutionary who revolutionized Mexico first by gaining presidency by paying off his opposition and allies along with war. Diaz system failed in the end because he failed to build an enduring system that could have outlived
Premium Mexico Wage Porfirio Díaz