45. In the reaction H2CO3+H2O=HCO3+H3O+ (1) (2) (3) (4) Determine which is the Bronsted acid? a. 2 and 3 b. 1 and 4 c. 1 and 2 d. 1 and 3 46. Dilution of a buffer will cause in its pH. a. nothing c. an increase b. none of the choices d. a decrease 47. Compound whose concentration has been determined by analysis and serves as a reference for titrimetric methods of analysis is a. primary standard c. standard solution b. secondary standard d. technical reagent