Experimental Techniques

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Kate Zeile 2D
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Joined: Sat Jul 22, 2017 3:01 am

Experimental Techniques

Postby Kate Zeile 2D » Sat Mar 10, 2018 8:39 am

What are some experimental techniques to measure the rate of the reaction? How would one monitor the concentration at precise instances after the reaction has initiated?

Lourick Bustamante 1B
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Re: Experimental Techniques

Postby Lourick Bustamante 1B » Sat Mar 10, 2018 8:58 am

To measure the rate of a reaction, you can use the differential rate law which is k[Reactancts]n with n being the amount of moles; the differential rate law is rate as a function of concentration of reactants. On the other hand, you can also use the integrated rate law which is [A]t = -kt + [A]0 for zero order, ln[A]t = -kt + ln[A]0 for first order, and 1/[A]t = kt + 1/[A]0 for second order; the integrated rate law is rate as a function of time.

Cassandra Mullen 1E
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Re: Experimental Techniques

Postby Cassandra Mullen 1E » Sat Mar 10, 2018 7:59 pm

Reaction rates can be measured through a spectrometric method, where a spectrophotometer measures light absorbance. A conductometric titration can also be used, which measures the voltage change over time as reactant is added. Titrations work well for slow reactions.

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Re: Experimental Techniques

Postby ZoeHahn1J » Sun Mar 11, 2018 10:12 pm

One could use spectrometry to measure the rate of very fast reactions since it tells us the absorption of a solution at very precise time units (ex: in stopped-flow technique), which can in turn be used to find the concentration of reactants/products at that time.

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