When 3 M HCl and 0.1 m BaCl2 are added to a solution of Na2 SO4

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

If two objects at different te,peraure are in contact with each other what happens to their temperature