Question

ACID & BASE
"E THE ANSWER FOR 1 MARK QUESTIONS :
What is the common name of water soluble bases?
Why does tooth decay start when the pH of mouth is lower than 5.57
Write two chemical properties of acid.
Write two chemical properties of base.
Write two chemical properties of salt.​

Answer 1

Answer:

Coz the acid affects our teeth and they start to decay due to the effeffeof acid

PROPERTIES OF ACID

1. ITS PH IS LESS THAN 7.

2 . BLUE LITMUS TURNS IN RED IN ACID .

PROPERTIES OF BASE

1. ITS PH IS GREATER THAN 7.
2. RED LITMUS TURNS BLUE IN BASE.

PROPERTIES OF SALTS

1. SALTS ARE IONIC IN NATURE DUE TO PRESENCE OF IONS.
2. THEY ARE CRYSTALLINE .
3. THEY ARE SOLUBLE IN WATER.

Answer 2

Answer:

1. Alkali

2. Tooth decay start when the pH of mouth is lower than 5.57 because tooth enamel is made up of calcium phosphate which is the hardest substance in the body. It does not dissolve in water, but is corroded when the pH of mouth is lower below 5.5. Bacteria present in mouth produce acids by degradation of sugar and food particles remaining in the mouth after eating.

3. Chemical properties of acids:

i) It contains H+ ions.

ii) It changes blue litmus paper into red.

4. Chemical properties of bases:

i) It contains OH- ions.

ii) It changes red litmus paper into blue.

5. Chemical properties of salts:

i) Salts are brittle, hard and crystalline solids.

ii) Salts are ionic in nature due to the presence of ions.

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