Question

1. What is the relative ionic strength of a solution of calcium sulfate compared to a solution of sodium chloride. What is the main contributor to this difference? 2. List 2 salts each that should have similar ionic strengths to: a) sodium phosphate, and b) magnesium phosphate. 3. Calculate the ionic strength of a 0.500 M. solution of sodium phosphate, and of a separate solution of 0.500 M magnesium phosphate. Which has the greater ionic strength? 4. Briefly explain why activity coefficients have a range between 0-1. 5. How far off was your uncorrected calculation of Ksp, compared to your activity-corrected Ksp? Did you think the difference would be this large? 6. Relating this experiment to acid-base chemistry, explain why pH = -log ah+ is a more accurate calculation than pH = -log [H+] when dealing with non-dilute solutions.

Answer 1

Thet m mole of Casoy áson & Calt + soug- I m oro I o ) mm and lanic Attenyth - 1 (m, z 2 + m 72 = + (n (2) + m. Cag2 - Ixim, um Thet m mole of pada Nad - Nattu mit-) mole of Cation m.) mole of anion Zt catia chasse z- & anim chalb m+= m- am ionic stength= f (mootm ci) 2) - fan = m

To Relative lenic I cason T nach A tength of Cason and Nadia um. 4 i mién imic strength of stemeth of Nach Cason is times H. the imic jonil strength depend on Concentration I of the sends more is the Cencentration in mort will be the lonic strength and Valency and Valency to t al n as, Valency of and u s o, I the lem is Ca 2+ and song is more than wat Valency is the os chasse on the main Contributos to the difference-