Lab Report 2-3 - Charmi Balsara Chang Ming Jiang Section...

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Charmi Balsara Chang Ming Jiang Section 420 April 6, 2011 Solubility and Spontaneity Abstract The goal of this experiment is to determine the solubility product, K sp , of Borax at different temperatures and to calculate the standard change in enthalpy (ΔH°), the standard change in entropy (ΔS°), and the Gibbs free energy (ΔG°) using a Van’t Hoff plot. Our group prepared a cold, saturated borax solution and performed a titration in order to determine the concentration of borax, from which we could calculate K sp . In order to plot van’t Hoff equation, which relates ΔH ° and ΔS° to temperature and K sp, we need to calculate ΔH° and ΔS°. The ΔH° can be calculated by evaluating K at two different temperatures, while ΔS° can be calculated from the Gibb’s free energy equation. From ΔH° and ΔS°, we can calculate ΔG°. From our experiments and calculations, we concluded that… Introduction In a dissolution reaction, the reaction will continue until the reactants and products have reached a balance of concentration. At this equilibrium point, the forward rate of reaction is equal to the reverse rate in reaction. This implies that the reaction can proceed in the forward direction, from the reactants to the products, or the reverse direction, from the products to the reactants, until there is no observable change in the reaction. Initially, in a dissolution reaction, the reaction rate increases when concentration of the reactants are high and decreases when they are low. Eventually, the reaction reaches an equilibrium in which the forward rate of reaction is equal to the reverse rate in reaction.
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Methods To prepare a cold borax solution, we first weighed about 10 g of borax, placed it in a 150mL
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Lab Report 2-3 - Charmi Balsara Chang Ming Jiang Section...

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