pH (1 Viewer)

[abbadell]

can someone please explain how to work out a solutions pH

 

[Riviet]

pH = -log₁₀[H₃0⁺], where [H₃0⁺] is the concentration of H₃0⁺ [in moles per litre or mol/L] in the substance or solution. Sorry I didn't explain it, it's one of those dotpoints that you can't really explain without doing all these mathematical proofs, which you don't need to know for the HSC course.

Edit: added minus sign, thanks for spotting that XcarvengerX.

 

[XcarvengerX]

Practical: use pH meter or indicators.
Theory: like Riviet said (Riviet forgot the minus sign in front of the log), but you can also change [H₃O⁺] with [H⁺] as they both are practically the same thing. The difference is that [H₃O⁺] is a [H⁺] that dissolves in water.
So, pH = -log₁₀[H⁺]
Conversely, [H⁺] = 10^-pH

 

[abbadell]

thanks for explaining that

 

[desmond.thai]

Can anyone tell me the pH for nicotine in its natural occuring form (as a liquid).

Thanks

 

[Riviet]

Nicotine is a liquid alkaloid. It is water soluble and has a pH of 8.5. It's a bitter-tasting liquid which is strongly alkaline in reaction and forms salts with acids.

 

[Dragie]

Nicotine is a liquid alkaloid. It is water soluble and has a pH of 8.5. It's a bitter-tasting liquid which is strongly alkaline in reaction and forms salts with acids.

Wow...very thorough