his homework is six pages OMEW RCIS Name Please staple all pages together Titrat

Question

his homework is six pages OMEW RCIS Name Please staple all pages together Titration of 50.00 mL HNO, with 0.3850 M NaoH mLNaoH Added 1. a Determine the following from the above graph: Equivalence Point Equivalence Point Initial pH pH b. write the reactions with the appropriate arrows for the reaction between HNO2 and NaoH: The HNO2 with NaOH reaction equation: Na Na Not The salt dissociation equation: NOL. The salt hydrolysis equation: H NOL, o H c. What is the molarity of the HNC2 solution? (Use the volume and molarity of the base.) D. 5 m d. What is the value of K. for HNO2 calculated from the 's equivalence point? 213

Explanation / Answer

pH calculation

g. at equivalence point [NO2-] formed = 0.1425 M x 50 ml/68.5 ml

                                                             = 0.104 M

NO- + H2O <==> HNO2 + OH-

let x amount has hydrolyzed

Kb = Kw/Ka = [HNO2][OH-]/[NO2-]

1 x 10^-14/6.5 x 10^-4 = x^2/0.104

x = [OH-] = 1.265 x 10^-6 M

pOH = -log[OH-] = 5.90

So,

pH = 14 - pOH = 8.10

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