Solubility System: Diammonium hydrogenphosphate with Diammonium carbonate, Dipotassium hydrogenphosphate, Dipotassium carbonate and Water
Components:

(1) Diammonium hydrogenphosphate, (NH4)2HPO4; [7783-28-0] NIST WebBook
(2) Ammonium carbonate, (NH4)2CO3; [506-87-6] NIST WebBook
(3) Dipotassium hydrogenphosphate, K2HPO4; [7758-11-4] NIST WebBook
(4) Dipotassium carbonate, K2CO3; [584-08-7] NIST WebBook
(5) Water, H2O; [7732-18-5] NIST WebBook

Original Measurements

Syromyatnikova, M. N.; Torocheshnikov, A. B.; Kuznetsova, Zh. Prikl. Khim. 52, 568 (1979).

Variables:

Ambient temperature: Composition at 0 °C, 10 °C, 20 °C and 30 °C.

Prepared by:

J. Eysseltová

Method/Apparatus/Procedure:

The isothermal method was used with 3.5 hours allowed for equilibration. Both liquid and solid phases were analyzed. NH4+ was determined by a distillation method1 P2O5 by the citrate method2 and potasssium gravimetrically as the tetraphenylborate. The solid phase was analyzed by the Schreinemaker's method.

Source and Purity of Materials:
  1. No information is given.
Estimated Errors:

Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.

References

1 Shokin, I. N.; Krasheninikov, S. A.; et al. Tekhnicheskiy Analiz i Kontrol' v Proizvodstve Neorganicheskikh Veshchestv, Izd. Vysshaya Shkola, Moscow 1968.
2 Kel'man, F. N.; Bruckus, E. B.; Osherovich, R. F.; Metody Analiza pri Kontrole Proizvodstva Sernoy Kisloty i Fosfornykh Udobreniy, Goskhimizdat, Moscow (1963).

Experimental Values:
Note: The authors present the following equation: y = A + 0.11 x, where y = total plant nutrient, and x = the mass ratio K2O/N. The following values for the parameter, A, are given:
Intercept values for equations of plant nutrient (y) v's mass ratio of K2O/N
T (°C) 1st coef.
0.0 26.11
10.0 28.4
20.0 30.48
30.0 33.0

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