Laboratory Experiments 89 5 Citric acid is often found in so

Laboratory Experiments 89 5. Citric acid is often found in soft drinks. What is its melting point? (Consult a handbook or the Intermet) Source: Handbook of Chemistry and Physics 6. p-Phenylenediamine (also named 1,4-diaminobenzene) dyes hair black. Is this substance a liquid or sobid at room temperature? (Consult a handbook or the Internet.) Source: Handhook of Chemistry and Physics 7-Household vinegar is a 5% solution of acetic acid. Consult your textbook or Appendix E and give the formula for acetic acid. 8. Consult the label on a can of Drano (not liquid) and write the chemical formula for the contents. (There are also small pieces of aluminum inside the can.)

Solution

5. Citric acid is a weak organic 2-hydroxypropane-1,2,3-tricarboxylic acid having melting point 153^oC

6. It is a pale brown liquid at room temperature

7. CH₃COOH

8.  Sodium hydroxide , NaOH. aluminium .