Discard the water layer, which contains the aspirin or acetominophen) and evaporate the chloroform layer to dryness under gentle heat. The result is codeine base, a white crystalline powder. Combine 20 mL pyridine and 25 mL conc. HCl in a beaker and heat strongly to 190C to drive off any water.
A simple sentence usually consists of a single finite clause with a finite verb that is independent. More complex sentences may contain multiple clauses. Main clauses (i.e. matrix clauses, independent clauses) are those that can stand alone as a sentence. Subordinate clauses (i.e. embedded clauses, dependent clauses) are those that would be awkward or incomplete alone.
independent & dependent clauses: coordination & subordination An independent person is one who can solve problems on his own, take care of his own needs, stand on his own two feet, so to speak. An independent clause (a clause is a group of words that contains at least one subject and one verb) is one that can stand on its own two feet--independently. You can join independent clauses if you want to. This is called coordination. A dependent person is one who needs help from another, more independent person. A dependent person needs to lean on someone stronger. A dependent clause is one that cannot stand on its own two feet--it needs an independent clause to lean on. You must join a dependent clause to an independent one. This is called subordination.