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Showing posts with label Heating effects on salts:. Show all posts
Showing posts with label Heating effects on salts:. Show all posts
Wednesday, March 16, 2022
Wednesday, January 13, 2021
What are heating effect of primary, secondary and tertiary salt of sodium phosphate?
NaH2PO4
(Primary phosphate) on heating undergo polymerization and form a stable hexamer
salt (sodiummetaphosphate) which known as
“CALGON” which also use as water softener. And Na2HPO4 (Secondary
phosphate) on heating dimerised to form Sodium
pyrophosphate while no effect
on (Na3PO4 )tertiary phosphate.
Related Questions:
Trisilyl amine, N(SiH3)3 is planar whereas trimethyl amines N(CH3)3 is pyramidal. Explain why?.
Why PCl3 hydrolysed while NCl3 can not be hydrolysed?
Tuesday, December 22, 2020
How to basic beryllium nitrate is obtained from beryllium nitrates?
Their is a unique feature of Beryllium nitrate , on heating at low temperature (125℃) it give Basic Beryllium nitrate , nitrogen gas and oxygen gas but at high temperature (above 1000℃) it give same products like other bivalent nitrate salts.
Thursday, November 12, 2020
What is the heating effect on metallic nitrate salts ?
Nitrates are prepared by
the action of nitric acid on a metal or its oxide, hydroxide or carbonate. All
nitrates are soluble in water. On heating, the nitrates
of the alkali metals yield only oxygen and the nitrite (Except Lithium).
Most of the nitrate salts of other metals on heating decompose to produce metal oxide ,nitrogen dioxide (NO2) and oxygen gas. (Except M= Na, K, Rb, Cs but lithium(Li) do as above)
If the metal oxides is unstable to heat, in
which case the metal and oxygen are formed for example from nitrates of mercury
(Hg), silver (Ag), Gold (Au), and Platinum (Pt) because Gibb”s free energy of
formation of these oxides are positive. (for more details see “Ellingham
diagram”).
Exception case: Ammonium nitrate gives dinitrogen oxide and steam:
Their is a unique feature of Beryllium nitrate , on heating at low temperature (125℃) it give Basic Beryllium nitrate , nitrogen gas and oxygen gas but at high temperature (above 1000℃) it give same products like other bivalent nitrate salts.
Related Questions:
What is structure of sodium perborate?
What is sodium perborate tetrahydrate?
How many nitrate groups are present in 1 molecule of basic beryllium nitrate?
What is the formula of "Mohar's Salt" ?
What is the Formula of Potash Alum?
What is formula of Carnalite ?
What is "calgon" ? Give structure and its uses?
Why Boric acid exist in solid state ?
What is structure of Borax: Tincal or Suhaga ?
What is structure of solid Ortho Boric acid ?
What is the structure of trimetaboric acid and trimetaborate ion?
Wednesday, October 7, 2020
What is effect of heat on Borax?
When borax is strongly heated on loop of platinum wire, it loses water and form dehydrated disodium tetra borate which is swells into the white mass, which on further heating disodium tetra borate melts to form a transparent glassy solid called borax glass and borax bead.
When a solution of given salt is heated on bead , then volatile part of salt displaced by B2O3 and corresponding metaborates salt is formed which gives Characteristic colour on oxidizing and reducing flame and colour of the bead is noted in hot and cold for each type of flame. This is also called "BORAX BEAD TEST"
Related Questions:
Why Ga has small size than Al exceptionally
Why aqueous solution of borax reacts with two moles of acids ?
What is structure of solid Ortho Boric acid ?
What is the structure of trimetaboric acid and trimetaborate ion?
Why Borazine is more reactive than benzene towards Electrophic Aromatic substitution reactions ?
Why Borazine (B3N3H6) is also known as inorganic benzene ?.
Why B-F bond length in BF3 is shorter (130 pm) than B-F bond Iength in BF4- (143 pm)?. Explain.
Why B-F do not exist as dimer?. Explain.
Although anhydrous aluminium chloride is covalent but its aqueous solution is ionic in nature. Why?
Why Boric acid become strong acid in the presence of cis 1,2-diol or 1,3-diol ?
Four-center two-electron bond (4C-2e Bond): Structure of AlCl3:
What is the molecular formula of Borax ?
What is the difference between the structure of AlCl3 and diborane?
Sunday, September 6, 2020
What happened when lead oxide is strongly heated ?
When heated, lead(II) nitrate crystals decompose into lead(2)oxide, oxygen and nitrogen dioxide.
2 Pb(NO3)2(s) → 2 PbO (s) + 4 NO2(g) +O2(g)
Due to this property, lead nitrate is used in firewoks.
Related Questions:
What are the SESQUI OXIDES ? give the examples.
Monday, April 13, 2020
Why both BeCO3 and BeSO4 are unstable to heat, while BaCO3 and BaSO4 are stable.Explain?
The decomposition of a salt is promoted by the formation of a new compound with high lattice energy. From BeCO3 and BeSO4, BeO will be formed by decomposition. The small doubly charged ions will result in very high lattice energy for BeO which will help to drive the reaction. (Reaction is also favoured by an increase in entropy since a gaseous product is formed).
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