lecture-5 part-2

lecture-5 part-2 - In class quiz at END of lecture...

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In class quiz at END of lecture ALTERNATE SEATING PLEASE Lab report due !!!!!!!!!!!! You will be working with Caustic Solutions Today WEAR YOUR SAFTEY GOGGLES
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Background Background Strong and Weak Acids (and bases) Acids and bases can be characterized by the extent to which they dissociate in solution STRONG Fully Dissociated E.g., In water, HCl is a STRONG acid HCl (aq) H + (aq) + Cl - (aq) proceeds virtually to completion (no undissociated HCl ) + WEAK Partially Dissociated
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Acetic Acid ( CH 3 COOH), is a WEAK acid in water CH COOH (aq) CH 3 COO - (aq) + H + (aq) Lots of CH 3 COOH exists in UNDISSOCIATED form undissociated proceeds only slightly in the forward direction. dissociated
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A QUANTITATIVE measure of the strength or weakness of an acid ( or base ) is the DISSOCIATION CONSTANTS DISSOCIATION CONSTANTS
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How do we measure Ka ? We do two experiments. 1) First we measure the TOTAL amount of acid by doing a titration. In other words we measure the amount
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TITRATION TITRATION A reaction conducted by the slow addition of a precisely measured volume of a reagent solution (usually from a buret) to a precisely known amount of a substance until a SIGNAL indicates that the reaction between reagent and substance is complete SIGNAL is often a COLOR CHANGE , but it may be an observable change in another property.
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Consider titration of STRONG ACID with STRONG BASE, e.g., HCl and NaOH The reaction we conduct is basically: HCl + NaOH NaCl + H 2 O The reactants are strong and therefore fully dissociated . The products are water and salt,
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lecture-5 part-2 - In class quiz at END of lecture...

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