CP2 - Preparation of a Standard Solution

• properties of sample used


  have high molar mass

  be pure

  Must not be air sensitive or react with air components
• why must the acid have a high molar mass


  to reduce weighing errors
• sources of error


  solid may be lost when transferring from weighing boat to beaker

  Weighing errors
• how to reduce weighing errors


  meigh by difference then calculate mass of solid in the beaker
• risk assessment


  sulfamic aid: toxic so can irritate and burn skin/eyes

  glassware: broken glass can cause cuts

  other risks depends on substance used
• risk assessment- precautions


  sulfamic acid: wear goggles, clean up any spillages with paper towels

  glassware: don't place glassware near the edge of the desk, don't touch broken glass