Advertisements
Advertisements
Question
Define the following term: Efflorescence.
Solution
Efflorescence: It is the phenomenon by which hydrated salts on exposure to dry air, lose their water of crystallization and crumble to powder.
RELATED QUESTIONS
State what would you observe when Washing Soda Crystals are exposed to the atmosphere
Which of the following salt has a blue colour and why?
CuSO4.5H2O or CuSO4
What are the two main ways in which common salt (sodium chloride) occurs in nature?
Complete and balance the following chemical equations:
`NaCI (aq) + H_2O (l) `
Complete and balance the following chemical equations:
`NaCl + NH_3 + H_2O +CO_2`→
What is meant by 'a family of salts'? Explain with examples.
The number of molecules of water of crystallisation present in washing soda crystals is:
(a) five
(b) two
(c) ten
(d) seven
P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:
(a) blue litmus red?
A salt X when dissolved in distilled water gives a clear solution which turns red litmus blue. Explain the phenomenon.
What is a ‘salt’?
name two salts which are acidic.
State what would you observe when :
Washing soda crystals are exposed to the atmosphere.
State what would you observe when :
The salt ferric chloride is exposed to the atmosphere.
Name gases which has a sour taste.
Name the anion present in the following compound:
Compound A, when warmed with concentrated sulphuric acid, gives a gas which fumes in moist air and which gives dense white fumes with ammonia.
Write any five uses of salts.
Which of the following is not an acidic salt?
The Salt Story
From: The New Indian Express 9 March 2021
The salt pans in Marakkanam, a port town about 120 km from Chennai are the third largest producer of salt in Tamil Nadu. Separation of salt from water is a laborious process and the salt obtained is used as raw materials for manufacture of various sodium compounds.
One such compound is Sodium hydrogen carbonate, used in baking, as an antacid and in soda acid fire extinguishers.
The table shows the mass of various compounds obtained when 1litre of sea water is evaporated.
| COMPOUND | FORMULA | MASS OF SOLID PRESENT /g |
| Sodium Chloride | NaCl | 28.0 |
| Magnesium Chloride | MgCl2 | 8.0 |
| Magnesium Sulphate | MgSO4 | 6.0 |
| Calcium Sulphate | CaSO4 | 2.0 |
| Calcium Carbonate | CaCO3 | 1.0 |
| TOTAL AMOUNT OF SALT OBTAINED | 45.0 | |
How many grams of Magnesium Sulphate are present in 135g of solid left by evaporation of sea water?
One of the constituents of baking powder is sodium hydrogencarbonate. The other constituent is :
You are provided with the list of chemicals mentioned below in the box:
| Sodium hydroxide solution, copper carbonate, zinc, hydrochloric acid, copper, dilute sulphuric acid, chlorine, iron |
Using suitable chemicals from the list given, write a balanced chemical equation for the preparation of the salt mentioned below:
Sodium zincate
