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- You wish to prepare an HC2H3O2 buffer with a pH of 5.14. If the pKa of is 4.74, what ratio of C2H3O2⁻/HC2H3O2 must you use?Which of the following salts gives the following Ksp expression? Ksp=27s4 a.BaSO4 b.AgCl c.Ag2CO3 d.Al(OH)3A student determines that the value of Ka for H2CO3 = 5.7×10-7 . What is the value of pKa?
- What is the pK(b) of ClO₂⁻?(b) What is the pKₐ of the dimethylammonium ion, (CH₃)₂NH₂⁺?What is the concentration of free Hg2+ in 2.6061e-4 M Hg(NO3)2 and 1.1005 M NH3? Hg2+ + 4 NH3 → [Hg(NH3)4]2+ Kf = 1.800e+19Citric acid, a triprotic acid, has 3 pKa values (3.128, 4.761, and 6.396). What is the pKb of trisodium citrate? 1.34 x 10–11 7.604 10.872 9.239
- What is the pH of 500mL of a buffer solution of HC3H5O3 0.0570M and C3H5O3Na 0.0275M? Ka of HC3H5O3 = 1.9x10^-5At elevated temperatures, NaHCO3 is converted quantitatively to Na2CO3:Which of the following has the greatest buffer capacity? Underline your answer in every letter. a. 0.40M CH3COONa or 0.20M CH3COOH b. 0.40M CH3COONa or 0.60M CH3COOH c. 0.30M CH3COONa or 0.60M CH3COOH
- What Pb2+ concentration is needed to lower the concentration to 1.0 × 10-6 M? [Ksp of PbSO4 = 1.6 x 10-8]C6H5COOH(aq)+NaHCO3(aq) --> C6H5COONa(aq) +H2CO3 predict the equilibrium constant Kc when the pKa of C6H5COOH is 4.21 and the pKA of H2CO3 is 6.35What is the pKa of: -Ha -Hb -Hc -Hd The numbers listed are the possible pKa, its ok to use the amount or value more than once.