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Diprotic Acid

Q. Carbonic acid H2CO3 is a diprotic acid (Ka1 = 4.3x10-7; Ka2 = 5.6x10-11) (a) Write the two chemical equilibria that have the equilibrium constants Ka1 and Ka2. (b) For each of the following pH values, which species associated with carbonic acid is the most abundant and is the least abundant in the aqueous solution? pH = 3.5, pH = 7.0 , pH = 10.50

Solved • Oct 11, 2019

Diprotic Acid

Q. Calculate the pH and [SO42-] in 500. mL of sulfuric acid solution that was made by dilution of 13.3 mL of 3.0 M stock solution.

Solved • Jun 11, 2019

Diprotic Acid

Q. What is the equilibrium concentration of H2C2O4 in a 0.542 M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1 = 6.1 x 10–2 and Ka2 = 5.1 x 10–5.

Solved • Jun 2, 2019

Diprotic Acid

Q. For the diprotic weak acid H2A, Ka1 = 2.5 × 10-6 and Ka2 = 8.5 × 10-9. What is the pH of a 0.0750 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?

Solved • Apr 25, 2019

Diprotic Acid

Q. Nicotine, C10H14N2, is a base that will accept two protons (K1 = 7 × 10−7, K2 = 1.4 × 10−11). What is the concentration of each species present in a 0.050-M solution of nicotine?

Solved • Apr 4, 2019

Diprotic Acid

Q. What is the hydroxide-ion concentration in a 0.22 M solution of Na2CO3? For carbonic acid, Ka1 = 4.2 x 10–7 and Ka2 = 4.8 x 10–11

Solved • Mar 30, 2019

Diprotic Acid

Q. What is the hydroxide-ion concentration of a 0.250 M sodium oxalate (Na2C2O4) solution? For oxalic acid (H2C2O4), Ka1 = 5.6 x 10–2 and Ka2 = 5.1 x 10–5.

Solved • Mar 30, 2019