[cliverlong]

Consider dissolving an ionic compound such as sodium chloride in water.

Before adding the sodium chloride, the degree of disassociation of water molecule is measured by K_w.

Now, when the salt dissolves we normally think all the sodium and chlorine go to ions in solution, if water is in excess.

Now, does the presence of the Na⁺ and Cl^- have an impact on the degree of disassociation of the water?

If yes, how can we demonstrate this change in K_w?

If no impact on degree disassociation of water, how can we demonstrate that?


Thanks

Clive

[Borek]

Debye-Huckel theory and concentration vs thermodynamic dissociation constant is what you are looking for.

[AWK]

Consider dissolving an ionic compound such as sodium chloride in water.

Before adding the sodium chloride, the degree of disassociation of water molecule is measured by K_w.

Now, when the salt dissolves we normally think all the sodium and chlorine go to ions in solution, if water is in excess.

Now, does the presence of the Na⁺ and Cl^- have an impact on the degree of disassociation of the water?

If yes, how can we demonstrate this change in K_w?

If no impact on degree disassociation of water, how can we demonstrate that?


Thanks

Clive

Use a good pH meter and measure pH of this solution. It should be about 6.87 for 0.2 M NaCl