Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Average rate of a reaction is defined as the rate of change of concentration per unit time. It is calculated by dividing the total change in concentration of any one of the reactant or product by the total time taken to do so. Thus, mathematically Average rate Experimental determination of reaction rate The rate of a reaction is determined by measuring the concentration of any of the reactants or products after a definite interval of time. For this purpose any measurable property such as change in volume, pressure, refractive index, electrical conductivity or thermal conductivity etc. which is related to the concentration of species participating in the reaction is selected. The change in this property is measured as a function of time. The common practice to find the change in concentration is to withdraw a small amount of reaction mixture (2cm3 to 5cm3) at difference intervals of time. The sample is then placed in the freezing mixture of ice and sodium chloride. It is called freezing of reaction. The concentration at which the given interval is then determined by a suitable method. Then a graph plotted between concentration and time. Calculation of average rate of the reaction The average rate of reaction at any instant of time can also be calculated from the data of concentrated and time interval. On the basis of kinetic data a graph is plotted between concentrations versus time; One the two axis concentration and time, two equidistance points are taken with respect to the time at which the average rate is to be determined. The difference in the concentration corresponding to the points is calculated. The difference of concentration is then divided by the time interval between the selected equidistant points. This is illustrated by the example. The average rate at time’t’ can be calculated by measuring the change in concentration in the time interval from t1 to t2 (where t1 and t2 are two equidistant points about t. Thus, average rate at time‘t’ In a similar manner the average rate can also be determined by measuring the change in concentration or any other measurable property of product species as a function of time. The above idea is illustrated by taking the following example: Formation of ethyl acetate by reaction of acetic acid with methyl alcohol. The above reaction was performed by warming 500 cm3 of 1 M solution of acetic acid. The concentration of acetic acid (one of the reactant) and methyl acetate (one of the product) were determined separately at regular time intervals and were subsequently plotted as function of time.
give one book name about electromatric effect?&author name?
Physical Changes Physical changes are caused by mishandling of foods during harvesting, processing and distribution; these changes lead to reduced shelf life of foods. Crushin
what do you mean by the terms chromogen,auxochrome,bathochrome and hyposochrome?what role do they play in relation to colour and constitution?
explain the cooling curve
Redox systems in bioinorganic chemistry
what is the hybridization of transion state of sn2 rection
what are the applications of borazole
reactivity of f-block elements
diagonal relationship between Li and Mg
The configuration 1s 2 2s 2 2p 5 3s 1 shows: (1) Ground state of fluorine atom (2) Excited state of fluorine atom (3) Excited state of neon atom (4) Excited state
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd