Gen Chem Question Again

[Pinbear]

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I have several gen chem questions that I do not know.
Please help me on this.

Q1. Calcuating PH of .0015 M of H2SO4.
is it PH = -log [.0015] or PH= -log [.0015][2] ???
because there are two hydrogens ?

Q2. boing point/melting point strengh (I want make sure if my knowledge is correct)
Ionic > H-bond > Dipole > London ?

Q3. What is difference between volatile and non-volatile compound?

Q4. What is difference between Syncometer and barometer?

Q5, In common ion effect, what happens to the molar solubility and compound overall solubility?

Thank you so much

 

[CANgnome]

remember pH = -log [H+]

but you have to be careful, because in this case, HSO4- is a weak acid, while H2SO4 is a strong acid.

This means that the whole of the 0.0015M of H2SO4 will turn into HSO4-, while only a miniscule amount (compared to H2SO4) of HSO4 will lose protons to contribute to the [H+]

So, I would say pH = -log[0.0015]



Q2 -> yes

Q3 -> volatile compounds have higher vapor pressures, so they can attain atmospheric pressure more readily and become gaseous.

Q4 -> no clue

Q5 -> Ksp is always the same. Ive never heard of compound overall solubility before, much like Q4. But basically, if the common ion effect is present, the compound you want to dissolve will be less soluble, fewer moles will dissolve, but Ksp will be the same because that is a constant. Of course, this is unless you supersaturate something.