Chromates

again. The precipitate formed from the two latter steps was then boiled and then combined with acetic acid and Potassium Chromate to check for the presence of Pb2+. Upon mixing the precipitate with acetic acid and Potassium Chromate, a bright yellow solution was formed with no apparent precipitate. This bright yellow solution indicated that our unknown for part A contained Lead Chromate. In part, B the liquid that was decanted in step 3 was to be tested for the presence of either the presence of Barium

when I mixed them together it produced a dark blue with dark specks solution. I then added NaOH to revert back to the original solution but I got a yellow color with brown specks instead. Exercise 1: Equilibrium of Chromate and Dichromate Data Table 1. Chromate-Dichromate. Color of Chromate Color of Dichromate Number of drops of NaOH to shift chemical system Yellow orange 14 Data Table 2. Endothermic and Exothermic Shifts. Reaction at Room Temperature Reaction in Cold Water Bath

pseudo-first order reactions of 5 alcohols, ethanol, propanol, 2-methoxyethanol, 2-chloroethanol and glycolic acid, with a hydrogen chromate solution were observed to determine the effects of the variation of substituents of the alcohols on the rate of oxidation. In these reactions the alcohols are being oxidized by the hydrogen chromate ions in the hydrogen chromate solution. Pseudo-first order reactions are set up by having one of the reactant present in excess compared to the other reactant.

This experiment was performed to observe the formation of silver chromate from a reaction between silver nitrate and potassium chromate. In this double displacement reaction, the cations and anions of the two reactants swapped and produced silver chromate and potassium chromate. An indication of a reaction occurring between the silver nitrate and potassium chromate was the production of a red solid from the yellow potassium chromate and the clear silver nitrate. Potassium nitrate has its uses in applications

materials should be used to clean a spillage e.g. paper towels. Potassium Chromate – K2CrO4 Storage: Potassium chromate must be stored in a closed container in a cool, well ventilated place away from heat, ignition sources, combustible material, reducing agents and incombustible substances. Safety  Potassium Chromate is toxic so it should never be poured into a sink.  Immediate medical attention is required if potassium chromate is split on skin or eyes. The area on which the chemical is split must

1.1 Ion Implantation Ion implantation is a materials engineering operation where ions of a material are accelerated in an electric field and impacted into a solid. Ion implantation can also be referred to as a technique used to deposit precise quantities of n-type and p-type dopants or impurities into a semiconductor at a low temperature. Ion implantation alters the physical, chemical, electronic properties of a material by forcibly impacting different types of ions into the material. In ion implantation

Selective oxidation of primary and secondary alcohols to carbonyl compounds can be easily accomplished by using polymer-supported chromium (VI) reagents under anhydrous conditions. Polyvinyl pyrrolidone-supported chromate is prepared easily from 1, 6-hexanedioldiacrylate as the crosslinking agent by reacting with chromic anhydride in water. The insoluble reagent is useful in the selective oxidation of primary and secondary alcohols to their corresponding carbonyl compounds in high yield. The spent

concentration of ethanol in vodka was determined by back titration. A known amount of excess potassium chromate was added to the vodka sample to convert ethanol into acetic acid by oxidation. The amount of leftover chromate was determined by titration with iron (II) solution, prepared from dissolution of ferrous ammonium sulfate. Using the amount of chromate added to the vodka solution, the amount of chromate reacted was determined and used to find the amount of ethanol in the sample. A potentiometer in

the product must be precipitated out of the solution and then weighed. For this lab, lead (II) nitrate (Pb(NO3)2) and potassium chromate (K2CrO4) will be reacted together to demonstrate double replacement reaction between 2 ionic compounds. This was shown when chromate replaced the nitrate and formed lead (II) chromate, and when the nitrate replaced the chromate and formed potassium nitrate, which is shown in the

that had unique colors. We tested mystery element B with potassium chromate which made a neon yellow color, and that was the same as Mercury(II) Chloride. That left us with the last possible chemical which was Hg(NO3)2 and element F. In conclusion we ended up solving the mysteries of the mystery elements. The results were that mystery element A was Ammonium Hydroxide, B was Mercury(II) Chloride, C was Potassium Chromate, D was Silver Nitrate, E was Iron (III) Chloride, and F was Mercury(II)