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

Question

A. 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?

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

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

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

Explanation / Answer

a) for pH of solution, we need Ka1, Ka2 for H2CO3 acids

also we need Partial Pressure of CO2

For specifics, we would also need the total pressure of the container and composition of N2/H2O mix

b)

Yes, you could, since you can assume NaOH reacts readily with H2CO3, so there will be CO3-2 and HCO3- in solution, this is a buffer so you can relate with pKa values and Henderson hasselbach equation

c)

If we had 100 mM of NaCl, there will be higher osmotic pressure, also, the activity coefficient will increase as well, so the concnetraiton will be lower than that expected if ignoring activities

d)

Theoretically, yes, if we assume NaOH = has i = 2 (vant hoff value)

and NaCl = 2 as well

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.