Question

Background: A total of 8 drops were added, one at a time, to 70ml of distilled water. The additives were NaCl, AlCl_3, CaCl₂ to determine a slope while each drop was added in (separate trials).

Slopes:

NaCl - 89.93

AlCl₃ - 181.8

CaCl₂ - 149.2

Suppose sulfates (SO₄^2-) were used with the same 3 cations to do this experiment instead of chlorides. Write out the dissociation reactions that would take place for the 3 compounds and predict while compounds would have the highest, lowest, and median slopes on their conductivity plots.

Answer 1

As number of Ions produced on dissociation are highest for Aluminium Sulphate, so it will be having highest slope.

while, calcium sulphate produces only 2 ions, that is calcium & sulphate. therefore, its slope will be least.