Freezing point depression measurement has served as a routine experiment to measure the molar mass of organic compounds in the freshman chemistry laboratory. Using this principle we carried out a systematic study of the effect of anion size, charge, and nature in the salt dissociation in aqueous medium. No significant difference in the dissociation of chloride, bromide and iodide salts was observed. A similar study in determining the effect of hydrogen bonding and anion shape, using nitrate, sulfate and carbonate salts was also conducted. These experiments require multiple freezing point measurements in a short three-hour laboratory period. Modern temperature probes and digital devices to record temperature changes allow the completion of these experiments during a first semester undergraduate laboratory as a group activity learning exercise.