Heres the file.

1. bases&alkalis
GROUP MEMBERS:
CELINE, JIAN YUE, EUGENE, RACHEL

2. what are Bases?
a base is a substance that can
accept hydrogen ions (H +)

3. what are Alkalis?
 Basic, ionic salt
 alkali metal or alkaline earth metal element.
 a base that dissolves in water.
 A solution of a soluble base has a pH greater than 7.
 A soluble base is referred to as an alkali if it contains and
releases hydroxide ions (OH−).

4. physical properties of alkalis
1. Alkalis have a BITTER taste & have a SOAPY touch
2. Alkalis turn RED litmus paper BLUE
3. Alkalis have a pH value > 7
4. Alkalis are CAUSTIC
5. Alkalis CONDUCT ELECTRICITY due to the presence
of MOBILE IONS in solution

5. chemical properties of alkalis
 Neutralization Reaction (Dilute Acid + Alkali –>
Salt + Water)
 Alkalireact with Ammonium Salts to
produce Ammonia Gas when heated gently
Alkali + Ammonium Salt –> Salt + Ammonia Gas
+ Water [Heat gently]

6. chemical properties of alkalis
 Precipitation of Insoluble Metal
Hydroxides from aqueous solutions
containing salts using common alkalis
such as NaOH & NH4OH
Metal Ions in Solution + Alkali –>
Insoluble Metal Hydroxide
(PRECIPITATES)

7. chemical properties of alkalis
E.g. :
Sodium Hydroxide + Iron (II) Sulphate
---
Iron (II) Hydroxide + Sodium Sulphate.

8. acknowledgements
 Presentation Created by Jian Yue.
 Research by Rachel
 Thanks to all sources that helped this presentation come true.
 We apologize for any accidental, unconditional copyrights. If there
is any clarifications, please kindly approach us.
 Software used to build this: Microsoft Powerpoint 2013 Preview.

9. Definition : Caustic
the property of a
substance that
causes corrosion