assingment on the physical properties of acids and bases
PHYSICAL PROPERTIES OF ACIDS:
1. Acids have a SOUR taste
2. All acids are SOLUBLE in water
3. Acids solutions turn BLUE litmus paper RED
4. Acid solutions have a pH values < 7
5. Most acid solutions are CORROSIVE
6. All dilute acids CONDUCT ELECTRICITY due to the presence MOBILE IONS in solution
7. React with reactive metals (above H in Reactivity Series) to form Salt & Hydrogen Gas
8. React with Metal Carbonates to form Salt, Carbon Dioxide & Water
9. React with Bases/Alkali to form Salt & Water Neutralisation Reaction)
empirical definition of acids: acids are aqueous solutions that have a sour taste, a pH higher than 7 and are conductive.
A base is most commonly thought of as an aqueous substance that can accept H+ ions.
Bases are usually oxides and hydroxides of metals. Bases that dissolve in water are called alkalis. They have the following properties:
1. Bases are bitter to taste and soapy to touch.
2. Bases turn red litmus paper blue.
3. Bases are characterised by the presence of hydroxyl (-OH) group.
4. Bases react with acids to form salt (a neutral substance) and water.
5. Bases are corrosive to skin; they should not be touched by hand.