Solution temperature k 1 22 2754 011 301 290 0247

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Solution # Temperature (K) 1 2.2 275.4 0.11 3.01 2.90 0.247 0.247 0.0608 0.00363 -2.801 2 22.8 296.0 0.29 5.45 5.16 0.439 0.439 0.192370 0.00338 -1.648 3 36.7 309.9 0.15 5.35 5.20 0.442 0.442 0.1954 0.00323 -1.633 4 46.8 320.0 0.11 5.32 5.21 0.443 0.443 0.196116 0.00313 -1.629 5 56.1 329.3 0.32 5.80 5.48 0.466 0.466 0.216970 0.00304 -1.528 6 68.0 341.2 0.08 6.41 6.33 0.538 0.538 0.289498 0.00293 -1.240 2 pts 2 pts 2 pts 4 pts slope -1919 K R 8.314 J/mol*K y-intercept 4.436 16.0 kJ/mol 36.9 J/mol*K 2 pts 2 pts Table 5: Titration Data and Calculations for Solutions #1-6 Temperature ( o C) Initial buret reading (mL) Final buret reading (mL) mL NaOH added mmoles HP - [HP - ] (M) K sp 1/T (K -1 ) ln K sp D H o Soln D S o Soln Place your plot of ln(K sp ) vs 1/T(K) here. Make your plot big enough to cover this instruction box so that it is large enought for someone else to read. Add a Trendline and Trendline Eqn and on your plot and be sure to include a titles for the plot and each axis. Type the calculation for determining [NaOH] for Run #1. moles KHP = moles NaOH = 0.00064moles [NaOH] = 0.000641 moles / 7.56E-3 L = 0.0848 M Calculate the % difference between Runs #1 and #2. %diff = (difference between values)/(avg of values) * 100 = (0.0848 - 0.0843 ) / 0.0846 *100 = 0.0005 / 0.0846 *100 = 0.591% Type the calculations you performed for mmoles of NaOH, [HP - ], and K sp for the Room Temperature solution (Solution #2). KHP --> K+ (aq) + HP- (aq) mmoles NaOH: moles NaOH = M * V = 0.085mol/L * 5.16E-3 L = 0.0004386mol mmoles NaOH = 0.4386 mmol mmoles NaOH = mmol HP- = 0.4386mmol [HP - ]: moles HP- / L = 0.4386 mmol / 1mL = 0.4386 M K sp : Ksp = [K+][HP-] = [HP-]^2 = 0.4386^2 = 0.1924 Type your calculations for D H and D S. D H = -slope * R = -(-1918.8K) * (8.314 J/mol*K) = 15.95 kJ/mol D S = (y-intercept) * R = 4.436 * 8.314 = 36.88 J/mol*K Guide for completing Table 5 : Move from left to right in this table, entering your data and doing the calculations necessary for the next column. In column C : convert T to Kelvin; in column F : calculate mL of NaOH added; in column G: calculate the mmoles (10 -3 moles) of KHP present (1:1 reaction between NaOH and KHP, so mmoles NaOH added equal mmoles of HP - present); in column H: calculate molarity of HP - (from mL and mmoles); in column I : calculate K sp from [HP - ]; in column J : calculate 1/T; and in column K: calculate ln K sp . Let Excel help with the calculations: enter your data for temperature and buret readings, then type the necessary formulas in the first cell of each of the other columns and copy the formula to the cells below it (down the column). 0.00200 0.00220 0.00240 0.00260 0.00280 0.00300 0.00320 0.00340 0.00360 0.00380 -3.000 -2.500 -2.000 -1.500 -1.000 -0.500 0.000 f(x) = − 1918.79552747967 x + 4.43591955234886 ln(Ksp) vs 1/T (K) 1/T (K) ln (Ksp)
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Page 3 of 4 (this is the room temp data from Table 5 and two more replicates) (the room temp data from row 105 in Table 5 will autofill in the first data row in Table 6 - row 168)
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