Question

write the name and formula of salt with : 2 molecules water, 5 molecules water, 10 molecules of water ( 50 points prize+ brainliest) for longest answer...

Answer 1

2 molecules -CaSO4.2H2O ( Calcium sulphate dihydrate /gypsum )

5 molecules -CuSO4.5H2O ( copper sulphate pentahydrate)

10 molecules -Na2CO3.10H2O ( sodium carbonate/washing soda )

Answer 2

(a) Gypsum – CaSO4 .2H2O

(b) Copper sulphate crystals – CuSO4 .5H2O

(c) Sodium carbonate crystals – Na2CO3 .

Gypsum-CuSO4.2H2O

Magnesium Heptahydrate-MgSO4.7H2O

Sodium Carbonate Deca hydrate-Na2CO3.10H2O

Water of crystallisation : Na2C03 10H2Ois hydrated sodium carbonate salt or sodium carbonate with water of crystallisation. Na2C03 is anhydrous sodium carbonate or salt of sodium carbonate (anhydrous) and 10H2O means water of crystallisation.

Borax, also called tincal or sodium tetraborate decahydrate has the formula (Na2B4O7·10H2O). So, borax has ten water of crystallization and not eight. Hence, it is known as tetraborare decahydrate

Water of crystallization or the water of hydration is the water that occurs in the crystals. It is denoted as hydrated compound nH2O. For example, gypsum is a soft mass having the formula CaSO4. 2H2O