Please help answer post lab questions 5 and 6. 5. Is the process of forming a bo
ID: 1035905 • Letter: P
Question
Please help answer post lab questions 5 and 6. 5. Is the process of forming a borax solution in water endothermic or exothermic? 6. Compare your two average values for the solubility equilibrium constant K(sp) at the two different temperatures. Are your results consistent with ale Chatelier’s principle? Explain why or why not.109 DATA: LABORATORY 7 A. Titration of Room Temperature Borax: K, Molarity of Standard HCl solution:&M; Temperature of room temperature borate mixture (T,): T, in /2Sc T, in 5 K Trial 1 Trial 2 Trial 3 (if done) 13 m Final buret reading HCI, mL Initial buret reading HCI, mL Volume of HCl used in Titration, m Moles HCI Moles Borate2 Molarity of Borate Molarity of Na" Kpl ml 0.002% mols 10.002 mols 0.13 M 0.126 M X lo -3 Average K of Borax:3x
Explanation / Answer
4.) When enthalpy is positive and delta H is greater than zero, this means that a system absorbed heat. This is called an endothermic reaction. Here delta H is positive so as per your calculation the reaction is endothermic.
5.) Le Chatelier's principle -
When any system at equilibrium is subjected to change in concentration, temperature, volume, or pressure, then the system readjusts itself to partly counteract the effect of the applied change and a new equilibrium is established.
In other words, whenever a system in equilibrium is disturbed the system will adjust itself in such a way that the effect of the change will be reduced or moderated.
In the first experiment, lets say at T1 = 19.5oC and in second experiment the temperature is reduced to T2 = 8.9oC
As a result the the Solubility will decrease and the solubility product constant (Ksp) value also decreases and the equilibrium will move backwards.
Hence our results are consistent with Le Chatelier’s principle.