ksp of borax

The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. (Assume the temperature remains constant.). Excess salt is added to water and the mixture is stirred until no more salt dissolves (the solution is saturated).

The indicator we will use for this titration is bromocresol green, which changes color from blue to yellow at a pH of 4.8 upon the addition of acid. You should clean and rinse three 250-mL Erlenmeyer flasks, an 800-mL beaker, two 400-mL beakers, a 150-mL beaker, a small test tube, two thermometers, a glass stirring-rod, the three 50-mL burets, and the 5.00-mL pipet before beginning. You may need to add additional borax to the solution in the 150-mL beaker as you heat it to maintain equilibrium. Add four drops of bromocresol green indicator to each of the three 250-mL Erlenmeyer flasks. Using a permanent marker, mark this test tube exactly at the water line.

Be certain that for each trial you can see crystals of solid borax at the bottom of the solution in the 150-mL beaker. 1400)-language text, Articles containing Spanish-language text, Articles containing Italian-language text, Articles containing Chinese-language text, Articles with unsourced statements from September 2019, Wikipedia articles needing clarification from April 2016, Wikipedia articles in need of updating from August 2016, All Wikipedia articles in need of updating, Creative Commons Attribution-ShareAlike License. Equation \ref{10} is one form of the van't Hoff equation that describes the temperature dependence of the thermodynamic equilibrium constant, \(K\), on temperature. Let’s consider a very familiar example of solubility. Next measure out a second 5.0-mL sample of the 10°C saturated borax solution (checking that the temperature is still the same) using the calibrated small test tube and pour this into a second clean rinsed 250-mL Erlenmeyer flask. We can equate the thermodynamic expressions: \[\Delta G^{o}_{rxn}=\Delta H^{o}_{rxn}-T \Delta S^{o}_{rxn} \label{8}\], \[\Delta G^{o}_{rxn}=-RT \ln K \label{9}\], \[\ln K=-\frac{\Delta H^{o}_{rxn}}{R} \left(\dfrac{1}{T}\right) + \frac{\Delta S^{o}_{rxn}}{R} \label{10}\]. You can also use this water to help rinse any borax out of your glassware. Periodically stop the stirring and make sure there is undissolved borax present. In addition to its use as a preservative, borax imparts a firm, rubbery texture to food. The name may refer to any of a number of closely related boron-containing mineral or chemical compounds that differ in their water of crystallization content. where \(Q^{o}_{sp}\) is the standard reaction solubility product quotient, which has a numerical value of unity and units that are the same as those as \(K_{sp}\).


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