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Chemsitry Paper 31!!!!

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i don't know whose ryt over here but i don't understand why r u dividing 5/2 to get 2.5 there is one student in our school who did like u did!!
because ratio of 2I- : I2 is 2:1 and we were using iodide, not iodine for the experiment......so u have to divide by 2 because the question was asking about iodine i think......:/
 
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no problem u will loose 1-2 marks for that but u will get the marks for the graph and for the table including units!!!!!

i hope so cz i did enter the units in the tavle and i took volume on x axis n rate on y axis i gota straight line too n the invigilator there sed dont copy even if yur ans are wrong they consider the method yuve done....according to tht u'll be rewarded..so i did it my way got almost the same but not exact..i hope there is ECF available..:/
 
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didn't the question say to divide by the total volume which was 20 cm3????? Then it would be 2.5*10-5* 1000/20 to give you 1.25*-3.... the question actually said divde by the total volume.. Didn't it?
 
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didn't the question say to divide by the total volume which was 20 cm3????? Then it would be 2.5*10-5* 1000/20 to give you 1.25*-3.... the question actually said divde by the total volume.. Didn't it?
i don't know about that total volume for that conc was 50cm^3 for which u had to find the conc!!
 
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Guys ..... wat if some1 makes a wrong observation and deduces their salt according to their own observation .... do they get the error carried forward mark ???
 
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Guys ..... wat if some1 makes a wrong observation and deduces their salt according to their own observation .... do they get the error carried forward mark ???
maybe!!btw u shouldn't get any wrong observation unless u have used wrong reagents to identify!!
 
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