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Saul Waters

Feb 20, 2025

You need to prepare 2.00 L of 0.100 M Na2CO3 solution. The best procedure is to weigh out…?

a. 10.6 g Na2CO3 and add 2.00 L of water to it.b. 21.2 g Na2CO3 and add 2.00 L of water to it.c. 10.6 g Na2CO3 and add water until the final solution has a volume of 2.00 L.d. 21.2 g Na2CO3 and add water until the final solution has a volume of 2.00 L.
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Using the Conc and the vol you can find out how many moles you need.moles = C x Vmoles = 0.100 mol/L x 2.00 L = 0.200 molNow convert the 0.200 moles back into mass by using mass = moles x molar massmass = 0.200 mol x 105.99 g/mol = 21.198 grams.... Show More
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molar mass of Na2CO3 = 106 g/molfind out how many moles of Na2CO3 you need:0.1 mol/L * 2 L = 0.2 molmultiply by molar mass to get a mass in grams:0.2 mol * 106 g/mol = 21.2 gyou would dissolve this in enough water so that the final volume is 2 L; you can't just add it to 2 L of water because the solute may occupy some volume such that the final volume would be more than 2 L and the concentration wouldn't be exactly 0.1 M.so the answer is D... Show More
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