MnCl2 won't dissolve?
Posted: Wed Apr 07, 2021 8:44 am
Hi all,
I am trying to dissolve 2g of anhydrous MnCl2 (pale pink powder/flakes) in 70ml demineralized water at room temperature with moderate manual stirring. Although solubility at RT is supposed to be high, I could not obtain the desired solution yet. All I am getting is a bright-brownish solution, from which, after resting for several hours, a very fine bright-brownish precipitate/fog settles. The remainder of the solution is visually clear and has a pH of roughly 6..7 according to an indicator paper strip.
I did some research on the WWW and all I came up with is that MnCl2 solution should be pale pink, while the colour I am observing rather hints at MnO(OH) as a result of Mn2+ oxidation.
Any ideas what the problem could be (aside from the one in front of the keyboard)?
Cheers,
T.
I am trying to dissolve 2g of anhydrous MnCl2 (pale pink powder/flakes) in 70ml demineralized water at room temperature with moderate manual stirring. Although solubility at RT is supposed to be high, I could not obtain the desired solution yet. All I am getting is a bright-brownish solution, from which, after resting for several hours, a very fine bright-brownish precipitate/fog settles. The remainder of the solution is visually clear and has a pH of roughly 6..7 according to an indicator paper strip.
I did some research on the WWW and all I came up with is that MnCl2 solution should be pale pink, while the colour I am observing rather hints at MnO(OH) as a result of Mn2+ oxidation.
Any ideas what the problem could be (aside from the one in front of the keyboard)?
Cheers,
T.