additional water was then added to the volumetric flask until the flask reached 50 ml if at any time prior to reaching 50 ml a precipitate formed more nitric acid was added following preparation of the bismuth solution a 1m solution of silver nitrate was prepared by adding 17 g of agno 3 to a 100 ml volumetric flask and subsequently adding sufficient water to reach the 100 ml mark on the neck of the flask the flask was then shaken until all of the silver salt was dissolved this solution was stored in the dark due to its light sensitivity next the incipient wetness of a 1 g sample of catapal u00ae c 1 was determined to measure this value the 1 g sample was placed in a plastic vial water was added to the alumina in increments of 10 weight of the total weight of the alumina 0 1 ml amounts mixing the water and the alumina vigorously with each addition as the point of incipient wetness was approached the catapal u00ae c 1 began to stick together as a solid mass as the solid mass began to form water was added dropwise until the point of incipient wetness was reached the incipient wetness for 1 g of catapal c 1 was 0 76086 ml g thus for 48 5 g 96 99 weight of a 50 g sample of catapal u00ae c 1 the total volume of water required to reach incipient wetness was about 38 0 ml as a result 13 ml of agno 3 0 013 mol ag solution was mixed with 0 043 ml of the bi no 3 3 solution 0 0000215 mol bi subsequently 25 ml of water was added to this mixture to reach the incipient.