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Change in Volume, Heat of Neutralization Volume and Temp

Change in Volume, Heat of Neutralization Volume and Temp

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Page ID: 128794

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Required Training	Required PPE
UC Lab Safety Fundamentals	Lab coat, safety glasses/goggles, nitrile gloves

Equipment	Chemicals
Two 250 mL Volumetric flask with	DI water and YELLOW food coloring
500 mL Volumetric flask	Absolute ethanol and BLUE food coloring
Digital Thermometer
Funnel (optional)

Procedure:

1) Pour the solutions into the larger flask and note the following

The volume increases due to formation of H₂O (3N solutions take the total volume up to the top of the 500 mL flask).
The temperature rises to ~105 Fahrenheit. Use a thermometer to measure this change.
The solution changes color.

Discussion:

Electrostriction is the drawing in of matter in a non-uniform electric field. The H⁺ ion (especially) and the OH^- break down the relatively open structure of pure water and form solvating spheres with a compact geometry. The water produced by neutralization, on the other hand, has the same open structure as the solvent

Hazards:

Be cautious with acids and bases as they can irritate and harm the skin or eyes. See SDS for accidental release and safety protocol.

SOP:

Corrosive – Hydrochloric Acid, Sodium Hydroxide

Disposal (by Storeroom):

The mixture can be disposed of down the drain with copious amounts of water.