Test-exam 2

034 gmol the net 2 16 h 2 mno4 5c2o4 2 mn 2 10co2

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Unformatted text preview: 34 g/mol). The net 2 16 H 2 MnO4 5C2O4 2 Mn 2 10CO2 ( g ) 8 H 2O If the concentration of KMnO4 is ~0.01M, what is approximate amount, in grams, of Na2C2O4 ( s ) a. 0.01 b. 0.1* c. 1 d. 10 e. 20 Ans. Let that is needed so that ~30-mL of KMnO4 is used in the standardization process?. x be the number of grams of Na2C2O4 , then molMnO 4 0.03L 0.01 L 5molC O2 24 2molMnO 4 133.998 gC O2 24 1molC O2 24 3 5. Following is a portion of part I of the Vitamin C experiment which shows the standardization of sodium thiosulfate. B Na2S2O35H2O Molar Mass(g/mol): 248.18414 Mass used(g): 3.8002 Volume(mL) 150 Conc(M) 0.10 A C D E F G Na2CO3 KIO3 KBrO3 KBr Vit_C 105.9884 214.00097 167.0005 119.0023 176.1241 0.2002 0.2225 0.1510 0.1011 100.00 100.00 0.01040 0.009042 H 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Part I Standardization of Thiosulfate Solution: KIO3 used(mL) KI(g) 6MHCl(mL) Initial buret reading(mL) Final/Initial buret reading(mL) Starch(mL) Final buret reading(mL) Na2S2O3 used(mL) KIO3 reacted(mol) Flask1 25.00 1 1 0.92 14.62 5 14.82 Flask2 25.00 1 1...
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This note was uploaded on 03/03/2011 for the course CHEM 100A taught by Professor Dai during the Spring '06 term at UCSD.

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