IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: girl_92 on May 30, 2010, 08:56:08 am
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How do we frame our answers for this dilution stuff one eg w09/52
and in many other places they ask about diltuing sulphurics acid prepairing 5 different solutions some1 plz help me
i woul,d be really thankful if sum1 culd provide a modal answer plz quick
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relax man. hahahaa.
anywyas so theres no sure way to structure the planing part cause wlel they always ask for somehting different. i you notice in the markscheme they only give marks for the stated question . so just follow the questoins
as for dilution , think about it this ways, if 1 solution is more concentrated the only possible reason is that it has less water or less diluted however the number of moles is the same . thus consider the eqn
moles= concentration x volume
if both soln have the same number of moles the only difference is the volumes thus you can equate the formulaes for the two soln.
concsoln1) x vol (soln 1) = conc (soln 2) x vol (soln 2)
thus you sub in the respective concentrations vol and concentration you want into the soln and youll get the volume needed .
hope this helps pm me if you need furthur explanatoins