Reference no: EM132439058
Question 1: Arsenic acid, H3AsO4(aq), is a weak polyprotic acid that is highly toxic. It is used as a wood preservative, a biocide and a reagent in the synthesis of some dyes. Arsenic acid reacts with water, as represented by the following Bronsted-Lowry equations.
H3AsO4(aq)+H2O(l)?H2AsO-4(aq)+H3O+(aq)
H2AsO4-(aq)+H2O(l)?HAsO2-4(aq)+H3O+(aq)
HAsO42-(aq)+H2O(l)?AsO3-4(aq)+H3O+(aq)
Match the following Ka values with the above equilibria.
Choice 1: 5.6x10^-3
Choice 1: 1.7x10^-7
Choice 1: 4.0x10^-12
Question 2: Consider 100 mL of acid represented by Ka = 2.3 x 10-9. If its concentration is 0.075 mol/L , what is the pH of the solution?
Question 3: Hydrazine, N2H4(aq), is used in the preparation of polymers, pharmaceuticals and rocket fuel. Hydrazine has alkaline properties similar to ammonia and will act as a weak base. If a 100 mL sample of 0.10 mol/L hydrazine solution has a pH of 10.55 at 25.0 °C, then the Kb of hydrazine expressed in scientific notation is a.b x 10-c mol/L. The values of a, b, and c are?
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