Question

for converting solution of 45 ml of 7% H2SO4 into 3% H2SO4 then solution dilute upto

Answer 1

7%= 700gm/1000ml (1L)...........(i)
3%=3 gm/100ml
=6gm/200ml.............(ii)
6gm from the H2SO4 bottle from 1and 2
700-------1000
3-------x. (x is the volume we will take from H2SO4 solution)

therefore,
x=6×1000/700
=8.571
finally to prepare 200ml of H2SO4 in concentration 3%

take 8.571 ml from H2SO4 solution and complete the volume to 200ml by the water...........hope it helps