Sprint LTE 6:08 PM Workshop 12 Download 2 of 5 Workshop 12. Aqueous Solutions Wa

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Sprint LTE 6:08 PM Workshop 12 Download 2 of 5 Workshop 12. Aqueous Solutions Water as a polar substance is a good solvent for polar and ionlic compounds Part 1. Solution Stoichiometry A lot of laboratory work in chemmistry involves chemical reactions that occur in aqueous solution. In order to understand solution stoichiometry it is imperative that you are very comfortable doing basic molarity and dilution calculations In this workshop you will begin with some basic calculations and then we will end with a challenging stoichiometry problem. A. Molarity calculations Consider a solution in which 12 g of barium nitrate are dissolved in 200 ml of water What is the molarity of the solution? b) How many moles of barium ions are there in the solution? )How mamy total moles of ions are there in the solution d) Dilution: You need to prepare 0.100L of 0.10M solution ofbarium nitrate from the initial solution (12 g of barium nitrate dissolved in 200 ml, of water). Discuss with your group and write down the step by-step procedure to prepare the solution Please include all prepare

Explanation / Answer

a)

M = mol/V

M = mass/MW / V = (12/261.337 ) /(0.2) = 0.22958 M

b)

moles of Ba2+ ions in solution

[Ba+2] = [Ba(NO3)2] = 0.22958 M

then

mol of Ba = 0.22958*0.2 = 0.045916 mol of Ba2+ ions

c)

total mol of ions

[Ba2+] and 2[NO3-] = 3[ions] = 3*0.045916 = 0.137748 mol of ions

d)

M1V1 = M2V2

0.22958 *Vstock = 0.1*0.1

Vstock = 0.1*0.1/0.22958 = 0.0435 L = 43.5 mL from stock solution

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