What volume of distilled water should be added to 400cm3 ...
What volume of distilled water should be added to 400cm3 of 2.0 mole dm-3 H2SO4 to obtain 0.20 mole dm-3 of solution>
600cm-3
800cm-3
1,000cm-3
3,600cm-3
4,000cm-3
Correct answer is D
400cm3→2moldm−3
0.4dm3→2moldm−3
Multiplying in order to get the moles of the acid.
0.4dm3×2moldm−3=0.8moles
After diluting to 0.2moldm−3, the new volume will be
0.80.2=4dm3
Converting back to cm^3,
We have 4×1000cm3=4000cm3
Hence, the volume of water added = (4000−400)cm3=3600cm3
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