The ph value of water is 7 but a salt which is derived from a weak acid will be less than 7 and a salt which is derived from a base will be above 7.
Polluted water. The growing crops and climate variability change. Basically the farming
Density will be mass/volume= 0.2/500 = 0.0004
D. Not all mixtures are heterogeneous
Gregor Mendel
Hope this helped !
