Melting Points Aliphatic acids with more than 8 carbons are solids at room temperature. Double bonds (especially cis)lower the melting point.The following acids all have 18 carbons: Stearic acid (saturated):72C Oleic acid (one cis double bond):16C Linoleic acid (two cis double bonds):-5C Chapter 20 11Chapter 20 11 Melting Points ▪ Aliphatic acids with more than 8 carbons are solids at room temperature. ▪ Double bonds (especially cis) lower the melting point. The following acids all have 18 carbons: ▪ Stearic acid (saturated): 72C ▪ Oleic acid (one cis double bond): 16C ▪ Linoleic acid (two cis double bonds): -5C