[Aqueous Maqueous]

Bear with me...

• How would NaCl increase the polarity of water? If it's dissolved in water then won't it decrease polarity?
• This is a simple one, but adding Calcium Hydroxide Ca(OH)₂ makes water basic by giving it OH^-?
• Calcium Hydroxide makes things in water (including water) less polar?
• How would 1-propanol attract caffeine?

Sorry for being vague but you can be vague back. I'm just looking for answers like London Dispersion Forces, you don't need to give an explanation.

[Aqueous Maqueous]

Some new notes upon further research:

NaCl is used as a salting out technique to increase the dielectric constant of the water. This helps 1-propanol keep form being miscible in water. Water is then less polar to Caffeine, and Caffeine then shifts it attraction towards 1-propanol and is separated out with it.

Calcium hydroxide is used to precipitate out the tannis (unneeded crap) from the water.

[Astrokel]

Hmm, did you mixed up polarity(depends on electronegativity&shape) and acidity/basicity(depends on H⁺/OH^-)?

[Aqueous Maqueous]

Hmm, did you mixed up polarity(depends on electronegativity&shape) and acidity/basicity(depends on H⁺/OH^-)?

I don't think I did. Correct me if I'm wrong.

[Astrokel]

I don't know because your 2nd and 3rd points on your first post talks about acidity then next polarity. What are you really asking about? How molecules dissolve in water?