====How to make 10% HCL====
  -Wear gloves and mask before starting to make 10% HCL.
  -Use fume hood to make 10% HCL.
  -Take 100ml volumetric flask and put it into a beaker to prevent the spillage of concentrated HCL over the surface.
  -Put these all things into the fume hood chamber.
  -Switch on the fume hood.
  -Shutter of fume hood should be half open to prevent the face injury.
  -Then take 100ml of concentrated HCL in 100ml volumetric flask.
  -Pour this 100ml concentrated 100ml HCL into 1000ml volumetric flask.
  -Make upto 1000ml with deionized water.
  -Switch off the fume hood.