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Question

quiz × bcswebdav/pid-4251246-dt-content-rid-28528217 Updates Not som updates automatically ersity [US] https://blackboard.stonybrook.edu/b hydrochloric acid solution. IF 46.33 mL of NaOH is needed to neutralize T0.00 mL the acid, what is the molar concentration of the acid? A) 0.0524 M B) 0.888 M C) 1.13 M D) 2.26 M E) 2.43 M 5. Consider the following unbalanced redox reaction in acidic solution: NaClO3 + H20+ L H1O2 + NaCl A 25.0 mL sample of 0.0833 M NaCIO, reacted with 30.0 mL of an aqueous solution of 12. How many grams of 12 were contained in the 12 solution? A) 0.264g B) 0.397g C) 0.236 g D) 0.159 g E) 0.317 g Exam 2, CHE 131 Falll 2015, Total 26 Questions Page2 F3 F4 F7 F8 4 5 6 7 8

Explanation / Answer

The balanced equation

5NaClO3 + 3I2 + 3H2O ---------------> 5NaCl + 6HIO3

no of moles of NaClO3 = molarity * volume in L

                                       = 0.0833*0.025 = 0.00208 moles

5 moles of NaClO3 react with 3 moles of I2

0.0021 moles of NaClO3 react with = 3*0.00208/5   = 0.00125moles of I2

mass of I2   = no of moles * gram molar mass

                  = 0.00125*253.8 =0.317g
moles NaClO3 = 25 x 0.0833 /1000 = 0.00208
The ratio between NaClO3 and I2 is 5 : 3
5 : 3 = 0.00208 : x
x = 0.00125 moles I2
Molecular weight of I2 = 253.8 g/mol
253.8 g/mol x 0.00125 mol = 0.317 g of I2

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