NIST-IUPAC Solubility Data Series

Ammonium dihydrogenphosphate with Sodium dihydrogenphosphate and Water (IUPAC SDS Volume 66)

SDS Volume

Volume 66. Ammonium Phosphates, p None

Source Publication

Shpunt, S. Ya.; Zh. Prikl. Khim. 13, 9 (1940).

Conditions:

Temperature and composition.

Compiler:

J. Eysseltová

Methodology:

A standard visual polythermic method and the isothermal method were used but no details are given. The $\ce{P2O5}$ content was determined by a standard method described in the 'NIUIF materials' but no reference is given. The ammonia content was determined by the Kjeldahl method. The sodium ion content was probably determined by difference (compiler).

Sample Information:

No information is given.

Measurement Errors:

Ambient temperature: The temperature was controlled to within ±0.2 K.
Mass concentration (m/v) (1): No information given.

System Components:

Ammonium dihydrogenphosphate, $\ce{ NH4H2PO4 }$; [7722-76-1] NIST WebBook
Sodium dihydrogenphosphate, $\ce{ NaH2PO4 }$; [7558-80-7] NIST WebBook
Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook

Experimental Data

$T$ (°C)	100w₁	100w₃	$100 x_{1} (\rm{solutes})$ (mol/100 mol)	$100 x_{3} (\rm{solutes})$ (mol/100 mol)	m₁ (mol/kg)	Phase (s) ()
-9.9	32.4	67.6	100.0^c	1.391 x 10³^c	3.99	A + C
-9.9	3.6	28.6	67.8	11.7	88.3	1.4 x 10³	0.46	3.51	A
-9.9	7.5	24.6	67.9	24.0	76.0	1.398 x 10³	0.96	3.02	A
-9.9	9.2	22.8	68.0	29.6	70.4	1.402 x 10³	1.18	2.79	A + B
-9.9	8.5	28.4	63.1	23.8	76.2	1.129 x 10³	1.17	3.75	B + C
-9.9	3.4	30.4	66.2	10.4	89.6	1.302 x 10³	0.45	3.83	C
-7	24.2	75.8	100.0	2.092 x 10³	2.66	A
-7	4.0	21.0	75.0	16.5	83.5	1.988 x 10³	0.46	2.33	A
-7	8.4	17.4	74.2	33.5	66.5	1.893 x 10³	0.98	1.95	A
-7	12.3	13.8	73.9	48.1	51.9	1.851 x 10³	1.45	1.56	A + B
-7	10.6	20.8	68.6	34.6	65.4	1.436 x 10³	1.34	2.53	B
-7	8.8	29.4	61.8	23.7	76.3	1.068 x 10³	1.24	3.96	B + C
-7	7.0	29.7	63.3	19.8	80.2	1.14 x 10³	0.96	3.91	C
-7	3.4	31.5	65.1	10.0	90.0	1.239 x 10³	0.45	4.03	C
-7	33.6	66.4	100.0	1.261 x 10³	4.22	C
-4.3	15.1	84.9	100.0	3.745 x 10³	1.48	A
-4.3	8.8	7.0	84.2	56.8	43.2	3.484 x 10³	0.91	0.69	A
-4.3	16.8	83.2	100.0	3.184 x 10³	1.76	A + B
-4.3	15.3	6.6	78.1	70.9	29.1	2.309 x 10³	1.70	0.70	B
-4.3	13.3	13.5	73.2	50.8	49.2	1.782 x 10³	1.58	1.54	B
-4.3	11.4	20.6	68.0	36.4	63.6	1.396 x 10³	1.46	2.52	B
-4.3	9.1	30.3	60.6	23.8	76.2	1.015 x 10³	1.30	4.16	B + C
-4.3	6.9	31.0	62.1	18.9	81.1	1.084 x 10³	0.96	4.16	C
-4.3	3.3	32.8	63.9	9.5	90.5	1.175 x 10³	0.45	4.28	C
-4.3	34.6	65.4	100.0	4.41	C
0	18.4	81.6	100.0	2.833 x 10³	1.96	B
0	16.9	6.4	76.7	73.4	26.6	2.127 x 10³	1.92	0.70	B
0	16.06	9.02	74.92	65.0	35.0	1.941 x 10³	1.86	1.00	B
0	14.7	13.1	72.2	54.0	46.0	1.697 x 10³	1.77	1.51	B
0	13.11	18.46	68.43	42.6	57.4	1.42 x 10³	1.66	2.25	B
0	12.9	20.0	67.1	40.1	59.9	1.333 x 10³	1.67	2.48	B
0	10.53	27.47	62.0	28.5	71.5	1.077 x 10³	1.48	3.69	B
0	10.0	31.1	58.9	25.1	74.9	944	1.48	4.40	B
0	9.64	31.69	58.67	24.1	75.9	937	1.43	4.50	B + C
0	9.8	31.7	58.5	24.3	75.7	931	1.46	4.51	B + C
0	6.7	33.2	60.1	17.4	82.8	999	0.97	4.60	C
0	5.8	33.5	60.7	15.3	84.7	1.024 x 10³	0.83	4.60	C
0	3.2	34.8	62.0	8.8	91.2	1.083 x 10³	0.45	4.68	C
0	2.62	34.84	62.54	7.3	92.7	1.109 x 10³	0.36	4.64	C
0	36.4	63.6	100.0	1.15 x 10³	4.77	C
10	21.8	78.2	100.0	2.288 x 10³	2.42	B
10	20.5	6.2	73.3	77.6	22.4	1.766 x 10³	2.43	0.70	B
10	18.0	12.7	69.3	59.7	40.3	1.47 x 10³	2.26	1.53	B
10	16.1	19.4	64.5	46.4	53.6	1.196 x 10³	2.16	2.51	B
10	12.7	30.2	57.1	30.5	69.5	875	1.93	4.41	B
10	11.5	34.1	54.4	26.0	74.0	788	1.84	5.22	B
10	11.1	35.5	53.4	24.6	75.4	757	1.81	5.54	B + C
10	6.2	38.0	55.8	14.6	85.4	838	0.96	5.67	C
10	3.0	39.5	57.5	7.3	92.7	9E+2	0.45	5.72	C
10	40.5	59.5	100.0	961	5.67	C
20	25.9	74.1	100.0	1.824 x 10³	3.04	B
20	24.2	5.7	70.1	81.4	18.6	1.508 x 10³	3.00	0.68	B
20	21.4	12.1	66.5	64.9	35.1	1.293 x 10³	2.80	1.52	B
20	19.5	18.9	61.6	51.8	48.2	1.048 x 10³	2.75	2.56	B
20	15.8	29.2	55.0	36.1	63.9	806	2.50	4.42	B
20	14.5	32.9	52.6	31.5	68.5	7.3E+2	2.40	5.21	B
20	13.4	36.7	49.9	27.6	72.4	658	2.33	6.13	B
20	12.4	39.1	48.5	24.9	75.1	621	2.22	6.72	B + C
20	5.7	42.9	51.4	12.2	87.8	701	0.96	6.95	C
20	2.8	44.2	53.0	6.2	93.8	7.5E+2	0.45	6.95	C
20	45.3	54.7	100.0	789	6.90	C
30	30.2	69.8	100.0	1.477 x 10³	3.76	B
30	28.0	5.5	66.5	84.0	16.0	1.278 x 10³	3.66	0.70	B
30	26.10	9.77	64.13	73.6	26.4	1.156 x 10³	3.54	1.27	B
30	25.2	11.5	63.3	69.5	30.5	1.116 x 10³	3.46	1.51	B
30	23.0	18.2	58.8	56.9	43.1	9.3E+2	3.40	2.58	B
30	20.0	24.97	55.03	45.6	54.4	802	3.16	3.78	B
30	18.6	28.2	53.2	40.7	59.3	745	3.04	4.42	B
30	17.1	31.9	50.8	36.1	63.9	678	2.96	5.23	B
30	16.2	35.4	48.4	32.3	67.7	617	2.91	6.09	B
30	15.78	35.62	48.60	31.6	68.4	622	2.82	6.11	B
30	13.30	41.89	44.81	24.9	75.1	536	2.58	7.79	B + C
30	13.20	41.60	45.20	24.9	75.1	544	2.54	7.67	B + C
30	9.55	43.75	46.70	18.5	81.5	5.8E+2	1.78	7.80	C
30	6.26	46.50	47.24	12.3	87.7	594	1.15	8.20	C
30	5.2	47.8	47.0	10.2	89.8	588	0.96	8.47	C
30	3.42	48.55	48.03	6.8	93.2	615	0.62	8.42	C
30	2.5	49.0	48.5	5.0	95.0	627	0.45	8.42	C
30	51.2	48.8	100.0	628	8.74	C