Baume Gravity

Question 1

Procedure

Answer 1

• use 250mL glass graduate
• be sure caustic does not have ice crystals in bottom of sample, if so let sample warm to dissolve crystals
• no temp measurement required
• verify hydrometer clean, if not rinse with water and dry with kimwipe
• under hood, using nitrile gloves transfer sample to graduate, without splashing. Sample should be poured to 250mL mark. Avoid formation of air bubbles
• gently lower Baumé hydrometer and impart slight spin to allow hydrometer to float without touching walls.
• allow time for hydrometer to come to rest and air bubbles to come to surface and dissipate
• record hydrometer reading as point on hydrometer scale where surface of liquid cuts scale, record to one decimal place
• if caustic opaque it will be necessary to add 0.1 correction

Question 2

Purpose

Answer 2

Baumé gravity indirectly determines concentration of solution. IRD commonly uses Baumé gravity for caustics. Baumé Gravity for water is 0. Higher Baumé Gravity, higher specific gravity, the heavier the product