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 and Dependent Clauses ï· There are two types of clauses: independent clauses and dependent clauses. A sentence contains at least one independent clause and may contain one or more dependent clauses. ï· An independent clause (or main clause) o is a complete thought. o can stand by itself. ï· A dependent clause (or subordinate clause) o is an incomplete thought. o cannot stand by itself. You can spot a dependent clause by identifying the subordinating conjunction.