CHEM 110 Lecture Notes - Lecture 3: Titration, Stoichiometry, Sodium Hydroxide
11 May 2018
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Experiment A3: Acid-Base Titrations
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Purpose.
The purpose of this experiment is to determine the concentration of an unknown substance through
acid-base titrations. Two different methods will be employed during this experiment which will
be compared to determine which technique proves more reliable results. This experiment has four
main objectives: Use mathematical concepts such as the mole concept and stoichiometry, Learn
how to write molecular and ionic equations for acid base reactions, Learn how to operate a burette
and, Observe the concept of neutralization.
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Document Summary
The purpose of this experiment is to determine the concentration of an unknown substance through acid-base titrations. Two different methods will be employed during this experiment which will be compared to determine which technique proves more reliable results. The experiment was carried out as described in experiment a3 found on pages 115-121. 1. 2g naoh/(0. 3ml)(40. 01g/mol) = 0. 1m naoh: hcl(aq) + naoh(aq) nacl(aq) + h2o(l, concentration = number of moles hcl / volume of hcl, number of moles of hcl= 0. 1 x 5= 0. 5 mol. Number moles of acid= number of moles of base. 0. 5mol of base used in the neutralization reaction: average = 6. 8ml, number of moles / volume. Volume of hydrochloric acid required in back of titration (ml) 2. 5ml [(18. 8-18. 3) x5: moles = m x v. 2 x 0. 00239mol naoh can react 0. 43g aspirin. 0. 43g aspirin requires 0. 00478 mol naoh (7. 45x10-8)(0. 43g) / 0. 00478 mol naoh = 0. 4273g.
