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31/10/2020 7:02 pm
Topic starter
(a) Write the name given to bases that are highly soluble in water. Give an example.
(b) How is tooth decay related to pH? How can it be prevented?
(c) Why does bee sting cause pain and irritation? Rubbing of baking soda on the sting area gives relief. How?
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31/10/2020 7:03 pm
(a) Alkali, e.g. NaOH (Sodium hydroxide).
(b) Lower the pH, more will be tooth decay. Acid reacts with Ca3(PO4)2 and cause tooth decay.
It can be prevented by brushing teeth after every meal.
(c) It is due to formic acid. Sodium hydrogen carbonate (Baking soda) neutralises formic acid giving relief.