EXP 1: Common Laboratory Operations

test tube with no measurement markings

What does a “non-calibrated” test tube mean?

19.70 mL

what is the proper measurement in the diagram

1/10

the portion of the test tube that is 2 mL is approximately __ of the test tube

1/4

the portion of the test tube that is 5 mL is approximately __ of the test tube

1/2

the portion of the test tube that is 10 mL is approximately __ of the test tube

glass rod

what piece of equipment can be used to transfer liquids from one vessel to another

to avoid spills of the liquid, especially if it is corrosive and dangerous

why should a glass rod be used to transfer liquids from one vessel to another

barrel

what is the name of (A)

collar

what is the name of (B)

air hole

what is the name of (C)

gas adjustment knob

what is the name of (D)

gas valve

what is the name of (E)

base

what is the name of (F)

(1) slightly open gas adjustment knob (2) close air holes (3) turn on lighter above the barrel

what 3 things should be done to the bunsen burner before turning on the gas

orange/yellow flame

what is the luminous flame of the bunsen burner

blue flame

what is the non-luminous flame of the bunsen burner

open air holes

how to turn luminous flame into non-luminous flame

45 degrees

what angle should a test tube be held when it is being heated above a bunsen burner

upper portion

what portion of the liquid should be heated first

to avoid the liquid from shooting out as bubbles from the test tube

why should the upper portion of a liquid be heated first before the bottom?

FeCl3

ferric chloride

NaOH

sodium hydroxide

Reddish Brownish Ferric Hydroxide (Fe(OH)3)

what is the color, name, formula of the precipitate formed between FeCl3 and NaOH

FeCl3 (aq) + 3 NaOH (aq) —> Fe(OH)3 (s) + 3 NaCl (aq)

what is the reaction between ferric chloride and sodium hydroxide

filtrate

what is the liquid that passes through the filter paper called

filtration, decantation, evaporation

three methods of separation in this experiment

sodium chloride (NaCl)

what was the filtrate

filtration

method of separating a liquid from a solid using a filter medium

supernatant liquid

liquid that is free from the precipitate during decantation

decantation

method of separating a liquid from a solid

evaporation

what method was used to prove the filtrate was NaCl

liquid evaporated, leaving white-powdery residue

what occurred after the NaCl was heated on the bunsen burner

residue

the solid resulting from evaporation

evaporating dish, wire gauze, clay flame shield

other than the bunsen burner, what equipments were used during evaporation

solid sodium chloride (NaCl)

what is the state, name, and chemical formula of the substance that remained after the NaCl was heated?