Chem 112-Exp 6 Lab Report-page 2 - Ka1(equivalence point at half volume of base added for second equivalence point=4.1 Equivalence point pH = 4.8 half

# Chem 112-Exp 6 Lab Report-page 2 - Ka1(equivalence point at...

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K a1 (equivalence point at half volume of base added for second equivalence point=4.1) Equivalence point pH = 4.8, half equivalence point pH= 4.8/2 = 2.4, pKa1 = 2.4 K a1 = 10 -pKa1 = 10 -2.4 = 3.98 E -3 K a3 (equivalence point estimate at 1.5x pH for second equivalence point=12.0) Equivalence point pH = 12.0, half equivalence point pH= 12.0/2 = 6.0, pKa3 = 6.0 K a3 = 10 -pKa3 = 10 -6.0 = 1.00 E -6 Exact concentration of acid in soda: At first equivalence point, M 1 V 1 (acid)=M 2 V 2 (base) At first equivalence point, 4.1 mL of 0.02 M NaOH added M 1 (10.0 mL)=(0.02 M NaOH)(4.1 mL) M 1 = 0.0082 M Citric Acid in soda Discussion: In the experiment, we determined the K a1 of the soda to be 3.98 E -3. This value is relatively close to the K a1 values we obtained in our last experiment of 5.01 E -3 (citric acid) and 6.31 E -3 (phosphoric acid) but is slightly closer to the K

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