4. What do you need to calculate pH of this solution? In what circumstances diss

Question

4. What do you need to calculate pH of this solution? In what circumstances dissociation will affect [CO2(aq)] and [H2CO3] and in what circumstances it will not?

5. What will happen if solution initially contained 1mM NaOH? Can you calculate final pH in this case?

6. What will change if solution contained 100 mM NaCl in addition to NaOH ?

7. Can you calculate freezing temperature of water under such gas atmosphere with and without NaOH/NaCl in the solution?

Explanation / Answer

Q4.

for this solution, we require a direct tada ot [H+] measurement. If no dat ais available we will require:

Concentrations, PArtial Pressure of CO2 and Ka1,Ka2 for carbonic acid

Dissoaciation affects CO2 and H2CO3 when pH is affected, therefore always

Q5.

If only 1mM of NaOH, then we could calculate directly, pOH then pH

Q6.

NaCl will increase Na+ concentration, therefore its activity changes, but if we do not use activities (i.e. we ignore them) then there is no problem

Q7

We could relate Partial Pressure with concentrations ,then concentrations with molarity, molarity with molality

eventually, we could calculate depression point as follows

dTf = -K*m*i

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