CHEM 1212 : Chem Lab Midterm
Document Summary
Never pour extra solution back into the main bottle: the meniscus is the bottom of the curve of the liquid that gives an accurate volume measurement (all measurements should be two digits pass the decimal) Toxic + corrosive, lachrymator: pre-lab questions, physical properties melting point, boiling point, color of liquid, chemical properties ability to dissolve metals, to react with oxygen, to dissolve in water. Increase percent yield: not filtering undissolved matter out of the rxn mixture (heavier mass, decrease percent yield, crystals left behind on filter paper (reduced mass); spilling solution (reduced mass) Also called metathesis reaction: cuso4(aq) + zn(s) cu(s) + znso4(aq) [single displacement reaction] Toxic + flammable: if a student rinsed with water instead of ethanol (heavier mass); if some zinc remained with the. The sour taste of fruit juicy is primarily due to citric acid, h3c6h5o7, a triprotic acid.
