EXP. 5-7

distillation

title of exp. 5

distillation

recover a liquid from a non volatile impurity

heat-liquid-vapor-liquid

process of distillation

boiling point

if pure liquids are distilled, the constant temp is

vaporize

in distillation, if volatile impurities are present it will— with pure substance

unequal rates

pure and impure substance distill in-

120 cc alcoholic sol, 4, 250 ml

in distillation exp. what is the reagent used, how many test tube were used. and capacity of distilling flask

40 drops(2ml), 5 cc

how many drops of alcohol were gathered per test tube in distillation, how many cc were used to test the flamability

purify substances based on boiling pts, avoid pressure buildup

purpose of distillation, why not fasten the receiver to condenser

1st- 90.3 C, 49.95s, 2nd- 87.5C, 46.4s, 3rd- 87.6C, 49.18s, 4th- 88C, 41.16s

readings and flammability of the distillation

boiling point

temp at which the vapor pressure is equal to external pressure

density, refractive index, mol wt, melting, boing point

4 constants

melting point

temp at which solid& liquid forms exist in equilibrium w/ atmospheric pressure

melting p. begins, sample entirely liquefied

2 temp recorded in melting point

.20-.5 C

true melting point range

micro-determination of boiling and melting point

exp. 6 title

2cc ethyl alc, 2 ½ cm, 1 cm

what are the reagents used in boiling point, bulb placement, measurement of condensation ring

liquid boiled and drop

when to know the b. point

benzoic acid from sublimation, 60cc coconut oil, 2, 3-5mm

reagents used in melting p. , how many capillary tube, measurement of depth of benzoic acid to the tube

ident of purity & compound, approx. indication of relative impurity of compound

2 ways of determination of melting p range

composition of most organic compounds

exp 7 title

CHONPS

what are the organic compounds in exp 7

egg albumin, water vapor

reagent in carbon and hydrogen exp 7, what collect in upper portion of test tube after heating it

carbon, hydrogen

charring indicates—, formation of water is —

½ g urea, 1g soda lime, NH3, urinelike

reagent used in nitrogen exp 7, and what was the gas evolve upon heating and turned litmus paper blue, and odor

2ml dilute naoh, egg albumin, few drops lead acetate

reagent in sulfur exp 7

black, PbS Lead Sulfide

color of ppr test for sulfur, name and formula

Naoh+Cao

soda lime composition

egg albumin, 1ml hno3, cold water, ammonium molybdate

reagents in phosphorus exp 7

yellow, ammonium phosphomolybdate

ppt in phosphorus, name and formula

green, decomp. of copper halide, beilstein test

in test for halogens exp 7. what color is the flame, what is responsible. name of test