13. Answer briefly III

 

When a ironfunnelfiltermagnet is brought near the mixture containing saw dust, naphthalene, and iron filings, it attracts them. Thus iron filings are separated.

 

The phenanthrenephenolphthaleinnaphthalenephenanthroline and saw dust mixture is put in a china dish and covered with a perforated asbestos sheet. An inverted funnel is placed over the asbestos sheet.

 

The open end of the funnel's stem is closed using cotton woolcamel woolsilk woolangora wool. The china dish is heated. The pure vapours of phenolphthaleinphenanthrenephenanthrolinenaphthalene solid pass through the holes in the asbestos sheet and condense on the inner side of the funnel. The saw dust is left in the china dish.