dimy grass

Decanted (A15):

* Liquid (A17) clear light golden yellow.

* Solid (A18), 15 g, crystal neeedles 10-30 mm long, thinner than (A16).

Total (A14)+(A16)+(A18): 94 g.  Should need 116 g of H2O at 60 C.  However, dissolved completely at 20 C giving a clear very pale yellow liq.  Still unsaturated at 2.4 C.  Should have added water more slowly.

Either it is a high hydrate, or not NH4H2PO4 at all.  Maybe it is DAP not MAP that crystallizes as needles?

Cooled (A17) to 19 C, filtered at ~20 C:

* Liquid (A21) clear pale yellow.

* Solid (A22) mass of small needles.

Pressed (A22) between napkins.  Heated the moist mass. Melted completely at ~65 C.  On cooling at 30 C became a sherbet-like mass of small soft crystals, soaked in light yellow syrupy liquid.  Let's see how much water it takes to dissolve at 40 C; then cool to 35 C and decant.

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