Study of Solubility Equilibrium of Khc4H4O6

2634 WordsMar 8, 201311 Pages
Name: Beatrice Yeo Zi Hui Lab Group: B1 Fume Hood Number: B4 Matriculation Number: A0102491R Email Address: a0102491@nus.edu.sg Date: 1st February 2013 CM1191 Experiment 1: Study of Solubility Equilibrium 1. Abstract The aim of this experiment is to determine the relationship between the solubility of potassium hydrogen tartrate (KHC4H4O6) and temperature. Titrate a known concentration of NaOH against a saturated solution of KHC4H4O6 at different temperatures to obtain the concentrations of KHC4H4O6, and hence the solubility product constant of KHC4H4O6 at various temperatures. It was found that the solubility product constant of KHC4H4O6 is higher at higher temperatures, thus it can be concluded that the salt is more…show more content…
For temperatures above room temperature, the whole procedure was again repeated twice. This time, a hot water bath was prepared on a hotplate stirrer. The conical flask with the unfiltered salt solution was placed inside the water bath until the temperature of the solution stabilized at 37ºC and 45ºC respectively. Likewise, during the filtration procedure, the conical flask with the unfiltered salt solution was kept in the hot water bath to maintain the temperature. 4. Data Treatment and Analysis 5.3 Standardization of NaOH solution Table 1: Mass of KHC8H4O4 and Volume of NaOH used | Mass of KHC8H4O4 (g) | Moles of KHC8H4O4 (mol) | Volume ofNaOH used (mL) | [NaOH](mol dm-3) | 1 | 0.4994 | 0.00244684 | 33.24 | 0.07361 | 2 | 0.5095 | 0.00249633 | 33.85 | 0.07375 | 3 | 0.5054 | 0.00247624 | 33.63 | 0.07363 | Sample calculation for 1st run: Molecular weight of KHC8H4O4 = 39.1 + 1 + 8(12) + 4(1) + 4(16) = 204.1 Moles of KHC8H4O4 = 0.4994 ÷ 204.1 = 0.00244684 mol Moles of NaOH used = Moles of KHC8H4O4 used = 0.00244684 mol [NaOH] = 0.0024468433.24 × 1000 = 0.07361 mol dm-3 (4sf) Average [NaOH] = 0.07361+0.07375+0.073633 = 0.07366 mol dm-3 (5dp) 5.4 Determination of the concentration of dissolved ion Table 2: Average volume of NaOH used and Ksp of KHC4H4O6 at different temperatures Temperature (ºC) | Average volume of NaOH used (mL) | Moles of

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