Bookmarks Develop Window Help 85% saplinglearning.com University of California M

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Bookmarks Develop Window Help 85% saplinglearning.com University of California Merced - CHEM 10 INCLUSIVE ACCESS) - Fall17 - ROBLEDO: Focus 6:Topics 6G and 6H Jump to... /6/2017 11:55 PM 52.5/1001 1/5/2017 10:35 PM Gradebook Print Calculator Pendic Table on 8 of 17 Sapling Learning Map The flask shown here contains 0.407 g of acid and a few drops of phen contains 0.100 M NaOH. mL ein indicator dissolved in water. The buret What volume of base is needed to reach the end point of the titration? 25 Number 35 mL base Assuming the acid is monoprotic, what is its molar mass? Click to begin Add base to the solution unti it just turns pink. You may need to reset the titration if you go past the end point. Number g/ mol O Previous ®Gve Up & View Souton eaeck AnswerNext tlEx about us careers privecy poicy te of use contact us | heyp

Explanation / Answer

Let HA be the acid

then,

NaOH + HA = NaA + H2O

ratio is 1:1 since it is monoprotic

then

mol of NaOH ( titrant ) = Molarity * Volume = 0.10 * Volume

Volume --> from your graph, add Volume until color changes to pink

then

mol of HA = mol of NaOH =  0.10 * Volume

Molar Mass = mass of acid / moles of acid

substitute

Molar Mass = mass of acid / ( 0.10 * Volume) = 0.407/0.1 / (Volume in mL*10^-3)

Molar mass = ( 0.407/0.1)(10^3) 1/Volume = 4070 / Volume in mL

for example, if V = 25 mL , then

MM = 0.4070/ Volume in mL = 4070/25 = 162.8 g/mol (you must substitute your Value of Volume)

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