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deducing order of reaction from concentration data and rate value

N

nawaaz bahadoor

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Hi everybody,
The question is from the A level CIE India Chemistry paper 9701/42 2016
4 (a) Ethanal, CH3CHO, dimerises in alkaline solution according to the following equation.
2CH3CHO → CH3CH(OH)CH2CHO
The initial rate of this reaction was measured, starting with different concentrations of CH3CHO
and OH–. The following results were obtained.

upload_2017-4-29_12-13-45.png
........................................................................................................................................ [1]
(i) Deduce the order of the reaction with respect to CH3CHO.
........................................................................................................................................ [1]
(ii) Deduce the order of the reaction with respect to OH–.
........................................................................................................................................ [1]

i am unable to deduce the order of reaction with respect to OH-
please help.thanks
 
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