No Answer needed - Calculate the molarity of a % 1.00E-3 by mass crystal violet

Question

No Answer needed - Calculate the molarity of a % 1.00E-3 by mass crystal violet solution assuming at this concentration the density of the solution is 1.00 g mL-1 and molar mass of crystal violet is 407.98 g mol-1.

No Answer needed - Calculate the molarity of a solution created, when 1.00 mL of the solution described in question #2 is mixed with 0.200 mL of 1.00 M NaOH (assume that a reaction hasn't started).

Need answer to this question: Why is it important to note the lab temperature when running these experiments?

Explanation / Answer

kinetic analysis of the reaction between crystal violet and NaOH is generally done to determine the order of reaction, rate of reaction and its activation energy.As the reaction is temperature dependent ,to determine the rate constant using Arrhenius equation ,its natural logarithm rate constant (ln K) is plotted against temperature(T)

lnK=ln A-Ea/RT (Ea=activation energy)

the slope =-Ea/R gives the vaue of Ea with R=universal gas constant=8.314 J/K.mol

rate constant K is a function of temperature,has different value at different temperatures.

Also the reaction CV+ +OH- -->CVOH (aq) is faster at higher temperatures.So to calculate initial concentrations (as asked in your questions), the temperature is important .The concentration after time (t) ,varies differently at different temperatures.

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