Unformatted text preview: int pink end point. 16. Record the final volume of the buret to the nearest 0.01 mL. 2 Chemistry 52 17. Repeat the titration procedure described above for at least two more trials. The number of trials run depends on: a. How much standardized sodium hydroxide solution you have available b. The precision of your data. CALCULATIONS:
Moles of base = (Molarity of base ) ´ (Liters of base ) Moles of acid (diluted vinegar ) = Moles of base Molarity of Diluted Vinegar = Moles of acid ( diluted vinegar ) Liters of acid ( diluted vinegar ) The MOLARITY OF THE ORIGINAL VINEGAR SOLUTION can be found by keeping in mind that the vinegar has been diluted ten times (from 25.00 mL to 250.0 mL) to obtain the DILUTED VINEGAR, whose molarity has been determined by titration with standardized NaOH. Gramsof HC2 H O mol HC2 H O 3 2 g HC2 H O 3 2 L vinegar mL vinegar 3 2 = ´
Gramsof vinegar L of vinegar mol HC2 H O mL vinegar g vinegar 3 2 Density of vinegar = 1.0052 g / mL % Weight HC H 3O Grams of HC H 3O 2 2
= ´ 100 Weight vinegar Grams of vinegar 3 Chemistry 52 Name:______________________ EXPERIMENT #5 REPORT FORM Molarit y of Standardized NaOH solut ion: M Final buret reading (mL) First __________ TITRATIONS Second Third __________ __________ Init ial buret reading (mL) __________ __________ __________ Volume of titrant (mL) __________ __________ __________ __________ Moles NaOH used (mo l) Show one sample calculations below: __________ __________ __________ __________ __________ __________ __________ __________ Molarit y of acid (M) __________ (diluted vinegar Show one sample calculations below: __________ __________ Average mo larit y of acid (M) (diluted vinegar) __________ Moles of HC2H3O2 used Volume of acid used (L) (diluted vinegar Deviat ion êdi ê __________ __________ Mean deviation __________ Relative Mean Deviat ion, RMD Molarit y of original vinegar (M) (before dilution) __________ __________ Weight of HC 2 H3 O 2 , % Weight of vinegar __________ 4 __________...
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