Chemical Forums

Chemistry Forums for Students => High School Chemistry Forum => Topic started by: theogenes on January 10, 2017, 03:57:11 AM

Title: KOH vs Ca(OH)2
Post by: theogenes on January 10, 2017, 03:57:11 AM

Was wondering the difference between Hydroxide and Oxide?

Like in the case of Calcium Hydroxide(slaked lime) vs Caclium Oxide?

or Potassium Hydroxide and Potassium Oxide?

Also why is Potassium Hydroxide caustic and nasty, yet Calcium Hydroxide doesn't seem so? ..both being a strong base?

Thanks in advance for any help.

Title: Re: KOH vs Ca(OH)2
Post by: AWK on January 10, 2017, 10:27:08 AM

Compare solubilities in water for both hydroxides.

Title: Re: KOH vs Ca(OH)2
Post by: Enthalpy on January 10, 2017, 10:47:40 AM

Calcium oxide: CaO. Hydroxide: Ca(OH)₂.
And while as brutal, calcium hydroxide isn't benign neither.

Title: Re: KOH vs Ca(OH)2
Post by: theogenes on January 10, 2017, 01:07:52 PM

Thank you for your posts. I appreciate the information.

I should compare a hydroxide and an oxide's solubility in water? or KOH vs Ca(OH)2?

Title: Re: KOH vs Ca(OH)2
Post by: AWK on January 10, 2017, 01:19:13 PM

Both oxides react with water (much heat is evolved). So compare only solubility of hydroxides. The first hydroxide is about 300 times more soluble then the second one.