Lab 14 Handin done

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Washtenaw Community College *

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101

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Chemistry

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Dec 6, 2023

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Lab 14 Hand-in Name: olivia Landry Purpose: To standardize a sodium hydroxide solution and determine the molarity of an acetic acid solution. Data: Table 1: Standardization of NaOH Molarity of HCl : 0.9535 M Final HCl buret reading (mL) 20.50 mL Final NaOH buret reading (mL) 27.80 mL Initial HCl buret reading (mL) 0.50 mL Initial NaOH buret reading (mL) 0.70 mL Table 2: Titration of unknown HC 2 H 3 O 2 Final HC 2 H 3 O 2 buret reading (mL) 20.30 mL Final NaOH buret reading (mL) 24.80 mL Initial HC 2 H 3 O 2 buret reading (mL) 0.30 mL Initial NaOH buret reading (mL) 0.40 mL Calculations: Part 1: Standardization of NaOH HCl (aq) + NaOH (aq) NaCl (aq) + H 2 O (l) Its balanced 1. Calculate volume of HCl. Convert to L Final HCl buret reading (mL) – Initial HCl buret reading (mL) = mL HCl 20.50 mL - 0.50 mL = 20mL Volume HCl mL x 1 L = L HCl 1000 mL 20 mL * 1/1000ml = 0.02L HCI 2. Calculate volume NaOH used in titration (Table 1). Convert to L Final NaOH buret reading – initial NaOH buret reading = mL NaOH 27.80 mL - 0.70 mL= 27.1mL NaOH Volume NaOH mL x 1 L = L NaOH 1000 mL 27.1mL NaOH*1/1000=0.0271L NaOH
3. Calculate the molarity of NaOH (mol NaOH/L NaOH) Record answer in Table 3. L HCl x mole HCl x mole NaOH x 1 = mol NaOH (M NaOH) L HCl mole HCl L NaOH L NaOH 0.02L HCI * 0.9535 M / 0.02L HCI .* 39.99mol NaOH / 36.46 mol HCI * 1 / 0.0271L NaOH = 38.59 M NaOH Part 2: Titration of unknown HC 2 H 3 O 2 NaOH (aq) + HC 2 H 3 O 2 (aq) NaC 2 H 3 O 2 (aq) + HOH (l) 4. Calculate volume of HC 2 H 3 O 2 used in titration. Convert to L. Final buret reading HC 2 H 3 O 2 – initial buret reading HC 2 H 3 O 2 = mL HC 2 H 3 O 2 20.30 mL - 0.30 mL = 20 mL HC2H3O2 Volume HC 2 H 3 O 2 in mL x 1 L = L HC 2 H 3 O 2 1000 mL 20 mL HC2H3O2 * 1 /1000 = 0.02L 5. Calculate volume of NaOH used in titration (Table 2). Convert to L. Final buret reading NaOH – initial buret reading NaOH = mL NaOH 24.80 mL - 0.40 mL= 24.40mL NaOH Volume NaOH in mL x 1 L = L NaOH 1000 mL 24.40mL NaOH * 1 / 1000 = 0.0244L 6. Calculate molarity of HC 2 H 3 O 2 (mol HC 2 H 3 O 2 /L HC 2 H 3 O 2 ). Report answer in Table 3. L NaOH x mol NaOH x mol HC 2 H 3 O 2 x ____1_____ = mol HC 2 H 3 O 2 /L HC 2 H 3 O 2 (M HC 2 H 3 O 2 ) from #1 from #2 Coefficients from balanced equation Molarity HCl in Table 1
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