Lime water is an opponent of acids: It turns the red colour of sour cherry juice to green.
Cherry juice is an indicator for acids (red) and for their opponents.  Universal indicator solution (U.I.) is a better indicator.
Acidic soils contain acids. Opponents of acids are present in lime soils (= alkaline soils).
* Right:  Put 2 g of different soils into the vials 1, 2, 3, 4, T,  mix them with 5 ml distilled water.
* Close these vials, shake them for a while, leave them for sedimentation.
* Left: Take a syringe to transfer 0.5 ml of each solution into different cavities of a blister packing.
   Add 1 drop of U.I. to each sample.
Observation:   Forest soil (3) and field soil 4 are as acidic as vinegar (control K),
                           clay soil from the Red Sea (T) are alkaline,  the other soils contain few acid.