Question

calculate the volume of 80% H2 S o4(density 1.80g/cc) required to prepare 1 litre of 20% H2 s o4 (density 1.25g/cc)​

Answer 1

Answer:

Explanation:

I would just clarify upon the already existing correct answer so as to make it more clear to wider audience.

Important thing to understand here is that density would provide the weight of H2SO4 alone (i.e, pure 100% H2SO4) in 1 litre of solvent (which is not specified and is not relevant for our discussion). Therefore, you obtain 1800 g of pure H2SO4 in 1 litre of solvent. But our actual solution is 80% (w/w) H2SO4. Hence, we need to take 80% of the 1800 g for our further calculations. And since we have assumed volume of solvent to be 1L, so molarity would just be equal to number of moles.