Draw structural formulas for the alkoxide ion and the alkyl(aryl)bromide that may be used in a Williamson synthesis of the ether shown. CH3 CH3- I CH3 • You do not have to consider stereochemistry. • Do not include counter-ions, e.g., Na+, I, in your answer. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate structures with + signs from the drop-down menu.

Can the solution be written out and solved step by step?

Please don't provide handwrritten solution .....

[References] Use the References to access important values if needed for this question. In the laboratory you dissolve 15.7 g of cobalt(II) fluoride in a volumetric flask and add water to a total volume of 125. mL. What is the molarity of the solution? M

2) You are tasked with determining the barium content of a sample containing barium nitrate mixed with rubidium nitrate. The sample is weighed, dissolved into 50.0mg water, and treated with xs 0.500M sodium sulfate. The acid fully ionizes in this experiment. A white precipitate forms which is washed, filtered, and weighed multiple times, according to the data given below: Mass of sample 0.425g Mass of thoroughly dried filter paper 1.462g Mass of precipitate+filter after 1st drying 1.755g Mass of precipitate+filter after 2nd drying 1.699g Mass of precipitate+filter after 3rd drying 1.698g

Masses :  Ca = 40.08 g   S= 32.07 g  O= 16.00 g  A 35.0 mL sample of CaSO4 was evaporated to dryness, leaving 0.967 g of residue. What was the molarity of the original solution?   step by step please

How will you separate soluble and insoluble impurities?

Please don't provide handwritten solution .....

If you by accident add more water than needed to your flask would the determined concentration of your unknown sample increase, decresae, or stay the same?

A 12 fluid ounce serving of milk contains mostly water and about 413 mg of calcium. What is the concentration of calcium in the aqueous liquid in units of Part Per Million on a mass basis (ppmm). There are 33.814 fluid ounces per liter.