50ml of 0.2N HCl , 50ml of 0.1N H2SO4 and 100ml of 0.2N of HNO3 are mixed . The normality of the resulting solution is
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use the formula N'(final normality)=( N1v1+N2v2+N3v3)/ v1+v2+v3
since all 3 are strong acids, everything will be added. in case you had say 100 ml 0.1N naoh or some other strong base, then you need to subtract Nv from it.(pls ask if there are doubts)
so expression gives 10+5+20/200=35/200= 0.175.
cheers. i am a chem expert. so you can ask me doubts!
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