Hard water deposits (calcium carbonate) have built up around your bathroom sink. Which of these substances would be most effective in dissolving the deposits? Select one:
a. ammonia
b. bleach (sodium hypochlorite)
c. lye (sodium hydroxide)
d. vinegar (acetic acid)
Note: Calcium carbonate dissolves in Vinegar as it is strong enough to do this , but it is cannot to dissolve metals (except such metal reacts with water).
