The Klein High School Science Lab

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The Klein High School Science Lab

• Chemistry Laboratory Safety

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Lab Safety Everyone is Responsible!

• "I didn't mean to" and "It wasn't my fault" are
  two statements that have no place in the lab.
• Horse-play will not be tolerated.
• Lack of pre-lab preparation is the biggest threat
  to lab safety.
• Read lab instructions prior to coming to lab. If
  you do not understand any procedure, ask your
  instructor for explanation.
• Never perform unauthorized or unsupervised
  experiments.

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Safety Glasses and a lab apron must be worn any
time you are in the lab area.

• Safety glasses are stored in the goggle cabinet
  at the front of the room, lab aprons are on the
  hooks at the front of the room
• Contact lenses increase the potential damage to
  the eye in a chemical accident, please wear your
  glasses for lab

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Long hair and bulky clothing are dangerous in the
lab area.

• There is a danger of catching fire, as well as
  being soaked in chemicals.
• Wear appropriate clothing.
• Tie back long hair.

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Rings, watches, and dangling jewelry are
dangerous in the lab area.

• Corrosive or irritating liquids may get
  underneath a ring or watch and produce
  irritation.
• Dangling jewelry may catch on a piece of labware
  and cause an accident.
• Always pay attention to verbal instructions given
  by your teacher.

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Prevention Smartest Move

• Before beginning work in lab, clean the lab bench
  top and your glassware
• Direct contact with chemicals should be kept to a
  minimum
• Never taste any chemicals or substances produced
  by a chemical reaction
• Eating or drinking in lab is never permitted Fume
  hood should be used when burning chemicals and
  when a chemical reaction gives off noxious gases

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Heating Precautions

• Do not heat heavy or thick glassware, such as
  graduated cylinder or reagent bottles.
• Avoid heating any apparatus too suddenly
• When heating a substance in a test tube, be
  careful not to point tube at another person or
  yourself
• Do not hold tip of test tube directly in the
  flame

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Accidents Can Happen

• Remain calm! A minor problem can quickly become a
  major one if you overreact.
• Report all accidents to your teacher immediately,
  no matter how small.
• Types of accidents and how to handle them

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Broken Glass

• The most common accident in the lab, even with
  the best of care.
• If you are using the equipment properly, you will
  not get into trouble for breaking a piece of
  glassware, but you will still be required to pay
  for the broken glassware.
• If you are not using the equipment properly, or
  if horse-play is involved, you will be required
  to pay for the broken glassware and disciplinary
  action may be taken.
• Report any breakage to your teacher immediately.
• Do not move until your teacher says it is safe to
  do so.
• If anyone is cut, report it immediately.
• Chemical spills are often involved with glass
  breakage. When that occurs, follow those safety
  precautions too.

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Cuts and Scrapes

• Report the situation and let your teacher help
  the injured person.
• There is always a possibility of infection, even
  with the most minor injury. For this reason you
  should report any cut or scrape, even if there is
  no visible blood.
• Do not come into contact with another person's
  blood, either directly or indirectly.

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Chemical Spills

• Chemical Safety Warning Signs - NFPA, ANSI, OSHA
• Depending on the chemical spilled the procedure
  can vary for most of the chemicals we will use,
  water is the best treatment flush the affected
  area with water for up to 15 minutes (20 minutes
  for eyes)
• The most potentially dangerous chemicals used in
  our lab are corrosive acids and bases. Always
  treat acids and bases with care even if you are
  using dilute solutions.
• You are to treat all spills as DANGEROUS.
• Stop where you are and let your teacher advise
  you about what to do.
• Always consult the proper Safety Data Sheet
  before doing anything. Sometimes adding water is
  not the proper step know those exceptions
• Kitty litter and baking soda are located in the
  hood for large spills.

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Fire

• Lab burners are the source of most problems
• Bunsen burners have very few malfunctions. If a
  malfunction occurs, turn off the gas and notify
  your teacher- end of problem.
• Be aware when a burner is in use at your lab
  station. Never leave a flame unattended
• When you are not actively heating something -
  turn the burner off.
• Clothing or Hair is the most dangerous type of
  fire in the lab.
• Don't panic!
• If you are the one involved in a fire - stay
  where you are - help is coming.
• If your partner is involved in a fire - get the
  fire blanket. Your teacher will be racing you to
  the blanket and both of you will help your
  partner smother the fire.
• If the fire is not at your lab station - stay
  away !
• The science teacher is the only person authorized
  to use the fire extinguisher

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Lab Safety Equipment
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Eye Wash/Shower Station

• Eye wash station is located on the right side of
  the lab. It should only be used if chemicals come
  in contact with the eyes
• Flood eyes and eyelids with water for a minimum
  of 20 minutes.
• Shower in the event that large amounts of
  chemicals are spilled or splashed onto the skin
  or clothing

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Fire Safety Blanket

• The fire safety blanket is located at the front
  of the science lab.
• Fire blankets are not the best means to
  extinguish a fire. They may be used to extinguish
  clothing that is burning, but should never be
  used on any other type of fire.
• Fire blankets are a good means to keep shock
  victims warm.

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Fire Extinguisher

• The fire extinguisher is located on the lab wall.
  
• Only the science facilitator is authorized to use
  the fire extinguisher.
• Fire extinguishers are classified according to a
  particular fire type and are given the same
  letter and symbol classification as that of the
  fire.
• Types of extinguishers
• TYPE A -- Combustibles wood, cloth, paper, rubber
  and plastics.
• TYPE B -- Flammable liquids, oil, grease and
  paint thinners.
• TYPE C -- Energized electrical equipment
• TYPE D -- Combustible metals (magnesium,
  titanium, sodium, lithium, potassium).
• Multipurpose Extinguishers are an effective agent
  against Types A, B, and C fires.
• Our laboratory fire extinguisher is Type ABC.
• To effectively operate an extinguisher, think
  P-A-S-S.
• P -- pull the pinA -- aim the hose at the base
  of the fireS -- squeeze the handleS -- sweep
  the hose back and forth

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Protect others

• Clean-up is important for the safety of others
  and for the preservation of equipment.
• Your lab station and equipment should be cleaned
  before you worry about the lab report.
• What clean-up should be done after each lab?
• Dispose of chemicals as directed by your teacher
• NEVER put unused chemicals back into their
  original container.
• Return chemical containers to the chemical table.
  
• Wash and dry all glassware, then store properly.
• Clean hardware, but DO NOT wash. If any hardware
  is wet, dry completely before storing. This is to
  prevent rusting.
• Clean and dry your lab table.

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What is SDS ?

• Safety Data Sheet
• A non-standard form required of all chemical
  distributors
• Must contain all relevant information on a
  chemical including but not limited to
• health, fire, poison, causticity hazards
• first aid
• controls/special protections
• carcinogens
• physical/chemical characteristics
• spill/leak procedures

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Where Do We Find the SDS?

• SDS sheets are maintained in each
• chemical storeroom
• preparation room
• Ask your instructor if you wish to see one. You
  are expected to check SDS online for every lab.
  (http//avogadro.chem.iastate.edu/msds/MSDS_S.html
  )These sheets can be found on flinnsci.com. You
  should note storage, safety precautions, and skin
  damage.

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The NFPA Diamond

• National Fire Protection Association
• Standardized labeling system for chemical
  hazards
• Includes four color codes
• red (flammability) blue (health)
• yellow (reactivity) white (special warnings)
• Numerical Ratings
• o no hazard 1 slight 2 moderate
• 3 severe 4 extreme
• Used by KHS Science Department

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NFPA HazardLabel
Flammability

• Required on all chemical labels
• Scale value from 0-4

Reactivity
Health
Special Notice
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NFPA HazardLabel

• What is the greatest safety hazard for the
  chemical illustrated to the left?
• What is the reactivity value of the chemical?