I know that order of reaction for sulphuric acid is first order.
But when i did a experiment which is increase the concentration of the sulphuric acid and times the time take for the reaction to finish.
From one mole to 4 mole of the acid the reaction is faster and faster but why after 4 mole of sulphuric the time take longer and longer.
how to explain the change of mechanism for this case.
thanks alots
order of reaction
2008-03-17 1:08 pm
回答 (2)
2008-03-17 6:05 pm
✔ 最佳答案
The reaction is first order respect to H+(aq), but NOT first order to H2SO4.When H2SO4 is dilute, the sulphuric acid is about completely ionized in water to give H+(aq). When H2SO4 is not too concentrated, the degree of ionization of H2SO4 is still high. Therefore, the increase in the concentration of H2SO4 leads to the increase in the concentration of H+(aq).
When H2SO4 is concentrated ( 4 M or above), the sulphuric acid is not completely ionized. The degree of ionization of H2SO4 decreases as the increase in concentration of H2SO4. When the concentration of H2SO4 is increased to 100%, the degree of ioniziation drops to zero. Therefore, the reaction rate decreases as the decrease in the concentration of H+(aq) when the concentration of H2SO4 increases.
2008-03-18 12:06 pm
Thank you so much!! That help me a lots for my coursework
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