pointwise titrations of aluminium nitrate solutions with sodium fluoride were made at ionic strengths of 0.5 , 0.2 , 0.1 and 0.05m and at temperatures of 25 degrees and 37 degrees . the total al ( 3+ ) concentration was kept constant at 5 x 10 ( -4 ) m and the total f ( - ) concentration covered the range 5-20 x 10 ( -4 ) m with a minimum of 20 points per titration .
C0037508
sodium fluoride
C0016327
f