Question

Which solution contains the biggest amount, in mol, of chloride ions? A. 20 cm3 of 0.50 mol dm−3 NH4Cl B. 60 cm3 of 0.20 mol dm−3 MgCl2 C. 70 cm3 of 0.30 mol dm−3 NaCl D. 100 cm3 of 0.30 mol dm−3 ClCH2COOH

Answer 1

I make it `(B)`........

Explanation:

And to answer the question, we must calculate the molarity of of each solution with respect to chloride ions.

And `"number of moles"="concentration"xx"volume"`

For `(a):` there are `0.020*dm^3xx0.50*mol*dm^-3=0.01*mol`.

For `(b):` `0.060*dm^3xx0.20*mol*dm^-3xx"2 equiv"=0.024*mol`.

For `(c):` `0.070*dm^3xx0.30*mol*dm^-3=0.021*mol`.

For `(d):` THERE ARE NO CHLORIDE IONS IN SOLUTION. Why not?

Why did I double the quantity in `(b)`?