Question

рон 0.000398 TOH Acid/Base/Neutral 2.1 110 4.21 2.- In the following reaction identify the acid and its conjugate base and the base and its conjugate acid: Acid 3.- Determine the hydrogen and hydroxide concentration, when we dissolve 0.50 moles of the AH in 250 mL of solution. (Hint consider that [H+] is small) pKaa. 6.5 4.25 c. 5.6 x=[H*) = a. 2.12 * 104 b. 1.06 * 102 c. 3.86 * 10-5 [OH--a. 1.08 *1010 b. 8.82 10 c. 9.43 10 4.- if the measure pH of another solution of the previous buffer is 5.0 determine the value of the [A-/IAH] (Hint: pH - pKa + log [A-1/ [AHI) Solution a. 3.55 b. 5.62 c. 2.85 d.4.88 5-The following curve corresponds to the 14.00 12.00 10.00 8.00 6.00 4.00 2.00 0.0o 0.00 5.00 10.00 15.00 20.00 25.00 3000 350O 40.00 45.00 50.00 Volume of NaOH (mL) a.- Determine the 2 values of the pKa pKal a. 1.0 b.-3.0 c.-4.00 pKa2- a. 4.0 b. 10.0 c. 6.0 b.- Determine the pH and NaOH volume for both neutralizations points First neutralization pH- a. 6 b. 4.0 c. 6.0 Volume a. 21 b. 35 c. 15 Second neutralization pH-a. 12 b. 6 c. 8.8 Volume a. 42 b-70 c.35

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Answer 1

2. Acid is a proton donor. Base is a proron acceptor. The remaining species when an acid donates a proton is called conjugate base of that acid. T he resultimg species when a base accepts a proton is called conjugate acid of that base CH,CoOH(CH), NHCH,Coo (CH) NHH In this equation, CH,COOH donates a proton. CH3), NH accepts a proton. Acid CH3COOH Conjugate Base CH COo Base (CH NH Conjugate acid (CH NHH