O 3/2/2017 11:55 PM A o/3 Gradebook Print Calculator Periodic Table Question 3 o

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O 3/2/2017 11:55 PM A o/3 Gradebook Print Calculator Periodic Table Question 3 of 3 Map A Sapling Learning this question has been customized by Pamela Mills at city University of New York CUNY, Lehman Coll e reaction of the strong acid HCI with the weak base CH3NH2 is: To compute the p of the resulting solution if 33mL of 0.42M acid is mixed with 48mL of 0.60M base we need to start with the stoichiometry. Let's do the stoich in steps: Number Number D How many moles of base? How many moles of acid? What is the limiting reactant? Number How many moles of the excess reagent after reaction? Number What is the concentration of the excess reagent after reaction? Number What is the concentration of the pH active product after reaction? AO Previous Give Up & View Solution Check Answer Next Exit Hint

Explanation / Answer

moles of acid = 0.42 x 33 / 1000 = 0.01386

moles of base = 0.6 x 48 / 1000 = 0.0288

1 mole acid reacts with 1 mole base

limiting reagent = acid = HCl

exess reagent = 0.0288 - 0.01386 = 0.01494

exess reagent left = 0.01494

exess reagent left = [0.01494] / 0.081 = 0.18 M

moles of CH3NH3+  = 0.01386 / 0.081 = 0.17 M

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