Question

The reaction between phenolphthalein and hydroxide ion is first order with respect to the phenolphthalein and zero order with respect to the hydroxide. Calculate the rate constant for this reaction when the instantaneous rate of reaction is 2.5 x 10^-5moles per liter per second for a concentration of 0.00250 M for the phenolphthalein.

Group of answer choices

a. 0.010 M^-1 s^-1

b. 2.5 x 10^-5M/s

c. 0.010 s^-1

d. 0.010 M^-2 s^-1

e. cannot be determined from the given information

Answer 1

According to law of mass action, buie rate of reaction is directly proportional to molar conentrations of reactauts to their powers raised to their tricuicuretic Coetticieuth and Hydroxide phenolphendein - Reactants, Jaus Reaction is of first order wilth respect to phenolphthalein and zero order with respect to Hydroxide Ich a r = k [ phenolphthalein)' con-lo Given, Instantaneous ratern) = 2. 5x10 moe I's". cphenolphthalein 2=0.0025 m rate constant (K) = ? - K = 2.5x105 nas' (0.0025] 1 6.0025 y = 0.010 §'. option © correct