Chem - Experimental chemistry

burette is to __ d.p

2 d.p

pipette is to __ d.p

1 d.p

gas collection is dependent on:

nature of gas, solubility, density compared to air

neutral gases

Hydrogen and Oxygen

acidic gases

carbon dioxide, sulfur dioxide, chlorine, hydrogen chloride

alkaline gas

ammonia

not soluble/slightly soluble gases - 3

hydrogen, oxygen, carbon dioxide

soluble gases - 4

chlorine, hydrogen chloride, sulfur dioxide, ammonia

gas less dense than air - 2

hydrogen, ammonia

denser/slightly denser than air - 5

oxygen, carbon dioxide, sulfur dioxide, hydrogen chloride, chlorine

displacement of water requires gas to be:

insoluble/slightly soluble

downward delivery requires gas to be:

denser than air and soluble

upward delivery requires gas to be:

less dense than air and insoluble

using gas syringe is for:

monitoring rate of evolution of gas produced

acidic/neutral drying agent used for:

acidic gas

alkaline/neutral drying agent used for:

alkaline gas

any drying agent used for:

neutral gas

e.g acidic drying agent

concentrated sulfuric acid

e.g alkaline drying agent

quicklime, calcium oxide CaO

e.g neutral drying agent

calcium chloride CaCl2

sublimation

solid → gas

Rf =

distance of sport/distance of solvent front