14. Substances in Common Use

14. Substances in Common Use

discussion time

Poll

what is the chemical name of sodium chloride ?

• $NaCl_2$
  

• 2NaCl

• nacl1

• NaCl

Poll

what is the chemical name of NaHCO3 ?

• sodium bicarbonate

  (baking soda)

• sodium carbonate

  (washing soda)

Poll

which chemical equation means a washing soda ?

• Na2 CO3

• Na+CO-

• NaCl2

 $H^+$  - CATION (ACID)

 $OH^-$  - ANION (BASE)

 $H^+\ +\ \ OH^{-\ \ }=\ \ H_2O$  

Poll

 $H^+\ -$  

• ANION - ACID

• CATION - BASE

• ANION - BASE

• CATION - ACID

NEUTRALISATION REACTION.

 $H^{+\ }Cl^-\ +\ Na^+OH^-$  

 $NaCL\ +\ H_2O$  

Poll

1.Sodium chloride

• $NaCl$

• $Na^3CO^4$

Poll

2.Magnesium chloride

• $MgCl$

• $MgCl_2$

Ph Paper

• Ph- potential of

   $H^+$  ions.

• Ph paper originally has yellow paper.

• 7-neutral

• 1 - 6.9 = acid where 1 is the strongest acid and 6 is the weakest acid.

• 8-14 is the base/alkaline where 8 is weak base and 14 is strong base.

 $Na^+Cl_-\ +\ H^+OH_{-\ }=\ NaOH\ +HCL$  

SODIUM CHLORIDE + WATER = 
SODIUM HYDROXIDE + HYDROCHLORIC ACID

bleach powder

 $$CaOC{l}_2+C{O}_2⟶CaCO3+Cl2\uparrow$$ 

calcium oxychloride  + carbon dioxide = calcium carbonate + chlorine

 $\uparrow\ \ \ \ \ \ \ \ \ \ \ \ \ \ \downarrow$  

gas             precipitate