How does pH affect crystal growth?

[coolsalena]

Hi!
The crystal that I am growing is Mohr's salt. though i have already optimized the parameters (pH), i would like to know the reason why pH affects it's growth.

pH 1: no crystals formed
pH 2: crystals formed
Thanks!

 

[BigJDubs]

The pH of a solution can affect the solubility of compounds in it. At lower pH, the solubility of a compound is usually higher, meaning that more of the compound can be dissolved in the solution. On the other hand, at higher pH, the solubility of a compound tends to decrease, meaning less of the compound can be dissolved in the solution. Since the growth of Mohr's salt crystals depends on the availability of the dissolved ions that make up the crystal lattice, the amount of these ions available for crystal growth is affected by the pH of the solution. At higher pH, there will be fewer ions available for crystal growth, resulting in slower or no crystal growth. At lower pH, more ions will be available, resulting in faster crystal growth.