info@ormalearn.com   +254721524786

×

CHEMISTRY FORM 2


1. STRUCTURE OF THE ATOM, AND THE PERIODIC TABLE
2. CHEMICAL FAMILIES AND PATTERNS IN PROPERTIES
3. CHEMICAL BONDING AND STRUCTURE
4. SALTS
5. EFFECT OF AN ELECTRIC CURRENT ON SUBSTANCES
6. CARBON AND SOME OF ITS COMPOUNDS
Content developer

Salts: Types of salt

4.0 Salts


4.2 Types of salt


Salts can be classified in a number of ways. Study the formulae of selected salts below then answer Questions 4.2.


NaCl, KCl, NaNO3, KHCO3, NaHSO4, NH4Cl, ZnSO4, CuSO4, CaCO3, Na2S, Cu2S, ZnI2, PbBr2, Na2CO3, AgNO3, FeBr3, LiCl, Na3PO4, CaHPO4, (NH4)2HPO4, Ca3PO4, Na2SO3, Na2PO3


Questions 4.2

  1. Do all the salts have the same number of elements? Give a reason for your answer.
  2. Identify the salts in which all hydrogen ions in an acid are displaced by metallic ions.
  3. Suggest two methods or ways by which salts can be classified.

Answers to Questions 4.2


Salts are usually classified as:

(a) normal salts (in which all replaceable hydrogen ions are displaced by metals, e.g. ZnSO4), and acid salts (in which some replaceable hydrogen ions are retained, e.g. NaHSO4).

(b) soluble salts and insoluble salts

.

Acid salts are easy to identify from their name (e.g. sodium hydrogencarbonate) and formula (e.g. NaHCO3). But what about soluble and insoluble salts? Let us answer this in Section 4.3.