Calculate the PH that results when the following solution are mixed.

I.   35 ML of 0.20 M formic acid

II.  55 ML of 0.10 M sodium formate

III. 110 ML of water

Calculate the following solutions and explain how you would prepare them.

1) 400 ml of 60% (v/v) SDS

2) 150 ml of 2.5 M Tris (Trisaminomethane) (MW = 121.2)

3) 900 ml of 50% EDTA (w/v)

4) 25 ml of 0.5 M NaOH