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The pH of a saturated calcium hydroxide solution (aka lime) decreases with an increase in pH. (see figure 1 below) The temperature at the Honduran plants is generally in the range of 19-21 degrees C but during summers it can go up to about increase to 27 degrees C. This temperature change can change the pH of lime and thereby affect the working of the lime feeder and needs to be taken into consideration while designing the lime feeder. (It would be nice to have a sentence here that the solubility of lime decreases with lime and Explain how this is the expected behavior of a solute in water with respect to temperature. Why is pH of the saturated solution decreasing with increasing temperature?)
Table 2: Changes in pH of lime with respect to Temperature changes
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