A 0.213 M solution of HA has a pH of 2.87 at 25°C. What is the value of Ka for HA? (the answer should be entered with 3 significant figures; do not enter units; give answer in scientific notation--valid notation examples include 1.23e-8 and 1.23e8 and -1.23e-4 and 1.23e0) The rate law for a reaction is determined to be rate=k[A]3[B][C]x. If the reaction has an overall order of 8, what is the value of exponent for C? (the answer should be entered as a single digit number; do not enter units; examples include 0 and 1 and 2 and 3 and etc.)

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A: This question belong to Chemical Kinetics. Kc  = Kf/Kb,

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