Why are cimetidine and ranitidine better antacids than sodium hydrogencarbonate or magnesium or aluminium hydroxide?

Can aspartame be used as artifical sweetner by all people. Explain. 

What are artificial sweetening agents? Give two examples.

Explain the following terms with suitable examples:
(i) cationic detergents,
(ii) anionic detergents and
(iii) neutral detergents.

What are biodegradable and non-biodegradable detergents? Give one example of each.

Why do soaps not work in hard water?

Can you use soaps and synthetic detergents to check the hardness of water?