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experiment 18

# experiment 18 - Alana Green Experiment 18 Potentiometric...

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Alana Green Experiment 18: Potentiometric Analyses Section VO1 A. Molar Concentration of a weak acid solution Monoprotic acid Molar conc NaOH= .1028 M Trial 1 Trial 2 V of weak acid (mL) 25mL 25mL Initial buret reading NaOH (mL) 0 0 Final buret reading NaOH (mL) stoichiometric point 25.6mL 29.5mL V of NaOH dispensed (mL) 25.6-0=25.6mL 29.5-0=29.5mL Mol NaOH to stoichiometric point (mol) (25.6/1000)x0.1028= 0.00263molNaOH (29.5/1000)x0.1028= 0.00303 molNaOH Mol of acid (mol) (0.00263molOH)(1molHA/ 1molOH) = 0.00263molHA (0.00303molOH)(1molHA/ 1molOH) = 0.00303 molHA Molar conc of acid (mol/L) 0.00263molHA/.025LHA = 0.1052 0.00303molHA/.025LHA = 0.1212 Average molar conc of acid (mol/L) (0.1052+0.1212)/2 =0.1132 B. Molar Mass and the pKa of a solid weak acid Monoprotic acid Trial 1 Trial 2 Mass of dry solid acid (g) 0.302 0.303 Molar conc of NaOH 0.1028 0.1028 Initial buret reads (mL) 0 0 Final buret reads (mL) 31.2 31.2

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Alana Green Experiment 18: Potentiometric Analyses Section VO1 Stoichiometric point V of NaOH dispensed (mL) 31.2-0=31.2 31.2-0=31.2 Mol NaOH stoichiometric point (mol) (31.2/1000)x0.1028 = 0.00321 (31.2/1000)x0.1028 = 0.00321 Mol acid (mol) (0.00321molOH)(1molHA /1molOH)= 0.00321molHA (0.00321molOH)(1molHA /1molOH)= 0.00321molHA
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