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Sodium Hydroxide (NaOH)
- Sodium hydroxide (NaOH) -
- Is usually dispensed as semi spherical pellets.
- Is a caustic substance and skin contact should be avoided.
- Is hydroscopic (ie will absorb water from the air when exposed).
This means that an accurate, dry weight is difficult to determine
- NaOH (sodium hydroxide), when exposed to the air, will react with the carbon dioxide in air, to form sodium carbonate (see equation).
This means that sodium hydroxide as a solid or in solution will loose its strength with time and degree of exposure and solutions of NaOH will need to be standardised.
- Sodium hydroxide (NaOH) ionises in water as shown by the following equation -
| NaOH || + ||H2O||<=>||Na+|| + || OH- ||+||H2O|
This equation shows that in solution NaOH will release hydroxide ions (OH-).
The excess of OH- ions in solution causes that solution to be basic or alkaline and caustic.
- Sodium hydroxide (NaOH) solution and Titration-
- Sodium hydroxide's (NaOH) Molecular Weight -
The molecular weight of NaOH is 40
ie AW of Na = 23, O = 16 and H = 1
therefore 23 + 16 +1 = 40