Question

Which statement is incorrect?

Which statement is incorrect?
`I.` In a saturated solution the rate of dissolution is equal to the rate of precipitation;
`II.` In a saturated solution, the amount of dissolved solute depends on the amount of undissolved solute on the bottom of the flask.

Answer 1

`"Statement II is incorrect........"`

Explanation:

Whereas `"statement I"` seems to be kosher.

For `"statement I"` you have set up an equilibrium between dissolved and undissolved salt. Given equilibrium conditions, the rate of dissolution is equal to the rate of precipitation:

`NaCl(s) rightleftharpoonsNa^(+)(aq) + Cl^(-)(aq)`

But `"statement II"` is whack. The given equilibrium will occur WHATEVER the mass of undissolved salt. The amount of ions in solution is characteristic of a given temperature. Is it clear what I argue?