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Chemistry > Introduction to Ammonia and Preparation of Ammonia - Laboratory Method _ From Ammonium salt > Flashcards

Introduction to Ammonia and Preparation of Ammonia - Laboratory Method _ From Ammonium salt Flashcards

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1
Q

Ammonia was initially called as

A

Alkaline air

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2
Q

In 1774 Joseph Priestley prepared ammonia by

A

Heating slaked lime with sal ammoniac

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3
Q

Joseph priestley called it has alkaline air why

A

Since it is basic

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4
Q

in 1785 - Who studied chemical composition of the gas

A

Claude Berthelot

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5
Q

In 1800 who further established its basic composition and proved ammonia to be a compound from the elements of nitrogen and hydrogen

A

Davy

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6
Q

Ammonia occurs in

A

Free and chemically combined state

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7
Q

When is Ammonia produce in absence of air

A

When nitrogenous matter decays in the absence of air

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8
Q

_________ bacteria on organic matter in soil and _________ on nitrogenous organic matter , bring about the decomposition

A

Putrefying bacteria and Ammonifying bacteria

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9
Q

In the combined state __________ and ____________ are two important source of ammonia

A

Ammonium salts and Ammoniacal Liquor

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10
Q

Preparation of Ammonia - Laboratory Method - from ammonium salts

A

Heating of the mixture ammonium salt with alkali - [ Ca[oh]2] slaked lime

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11
Q

salts other than ____________ will not react with alkalis on heating to liberate ammonia

A

Ammonium salt

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12
Q

Ammonium salts are

A

White solids , soluble in water , liberate pungent smelling ammonia gas on heating with alkali

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13
Q

Laboratory method - From ammonium salts

Reactants

A

Ammonium chloride [ NH4CL] and calcium hydroxide [ slaked lime ]
in round bottom flask

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14
Q

Laboratory method - From ammonium salts

Products

A

Calcium chloride [CACL2] , Water [ H2O] , ammonia [ NH3]

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15
Q

Laboratory method - From ammonium salts

Procedure

A

The reactants are grounded together and heated slowly in round bottom flask
With its neck slopping Downwards

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16
Q

Laboratory method - From ammonium salts

Observation

A

The ammonia gas obtained in Flask X passes through delivery tube into drying tower and collected in an inverted gas jar

17
Q

Laboratory method - From ammonium salts

Drying agents

A

Quicklime [ CaO] in the drying tower

18
Q

Laboratory method - From ammonium salts

Precautions

A

The reactants should be finely powdered form to initiate maximum surface area and slaked lime used should be in higher ratio

19
Q

The round bottom flask is kept in

A

Inclined position

20
Q

NH4NO3 is not used as an Reactant Why ?

A

Since it is explosive and decomposes

21
Q

Laboratory method - From ammonium salts

Collection

A

Ammonia gas is collected by downward displacement of air

22
Q

Ammonia gas is

A

Lighter than air

23
Q

Ammonia gas is highly soluble in water ?

A

True

24
Q

Laboratory method - From ammonium salts

Identification

A

A glass rod dipped in conc. HCl acid is brought near the mouth of glass jar [Y] , If the jar is full dense white fumes of ammonium chloride are formed

25
Q

Higher ratio of weight of the alkali used

A

May counteract the loss by Sublimation of ammonium chloride on heating in the solid state

26
Q

Calcium hydroxide is used Why?

A

Its cheap

Unlike other Caustic alkali is not deliquescent

27
Q

Ammonium Nitrate is not used why ?

A

In the Laboratory since it is explosive and may decompose itself forming nitrate oxide and water vapour
All ammonium salt in general heated with alkali liberate - Ammonia

28
Q

Round bottom flask is kept in inclined position why?

A

The reactants being solid are grounded thoroughly to provide maximum surface area for reaction
Heated in Round bottom flask kept in inclined position so that Water vapour formed may not trickle back and crack the hot flask

29
Q

Drying agent used for drying ammonia

A

Quick lime [CaO]

30
Q

Why Quick lime is used ?

A

Quick Lime being basic in nature does not react with basic ammonium gas

31
Q

The drying agent which are not used

A

Conc. H2SO4 , P2O5
fused CaCl2
Since they react chemically with ammonia

32
Q

How ammonia gas is collected

A

Ammonia gas is collected by downward displacement of air
since its lighter than air
V.D ammonia = 8.5
V.D air = 14.4

33
Q

Ammonia gas is not collected over water

A

Since it is highly soluble in water

Chemistry (10 decks)

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