30W Wed 2:25 AM fari Fie Edit Mew History Bookmarks Makeup Lab Volumetric Analys

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30W Wed 2:25 AM fari Fie Edit Mew History Bookmarks Makeup Lab Volumetric Analysis 1: Preparing a Standard solution of Sodium Carbonate and Volumetric Analysis 2: Standardization of HCI Adapted with permission from www. ative-chemi uk, Nigel Saunders, Author Introduction solution is one whose concentration is known exactly. Standard solutions of liquids, for example acids, are easy to prepare and are usually supplied. Standard solutions of solids can be prepared by weighing a solid, and dissolving it in a known volume solution in a solution to standardize you are going to prepare a standard solution of sodium carbonate and then use that test solution of HCl lution and compare the accuracy of the determined by standardization to the calculated molarity of the solution. Standardization concentration of the titrant to determine the number of in titrations, are using the known volume and

Explanation / Answer

9)molarity of Na2CO3 solution is 1.2M

From the formula one mole of Na2CO3 has two moles of sodium ions.

Na2CO3 ---------> 2Na+ + CO3-2

thus the molarity of sodium ions = 2 x1.2 = 2.4 M

10) Usually sodium carbonate is available as decahydrate which afloresces in atmosphere(loses water) to give white powder of mono hydrate. Thus we will not know how many water of crystaliization are present to calculate the accurate molar mass. to void this we take sodium carbonate anhydrous.

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