NIST-IUPAC Solubility Data Series

Potassium formate with Strontium formate and Water (IUPAC SDS Volume 73)

SDS Volume

Volume 73. Metal and Ammonium Formate Systems, p None

Source Publication

Portnova, S. M.; Ahmatova, Zh. T.; Lepeshkov, I. N.; Zh. Neorg. Khim. 31, 2143-5 (1986).

Conditions:

Room Temp: Composition at 25 °C

Compilers:

St. Trendafilova, St. Tepavitcharova

Methodology:

The isothermal method was used. Four weeks were allowed for equilibration. The strontium content of both phases was determined complexometrically in a basic medium, using methylthymolblue as indicator. The potassium content was determined by the tetraphenylborate method [1]. The composition of the solid phases was determined by the Schreinemakers' method.

Sample Information:

Suprapure grade $\ce{Sr(CHO2)2.2H2O}$ was recrystallized. $\ce{KCHO2}$ was prepared by the reaction of $\ce{KOH}$ with $\ce{H2CO2}$.

Measurement Errors:

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

Methodology Citation

¹ Rusakova, G. G.; Zh. Anal. Khim. 18, 154 (1963).

System Components:

Potassium formate, $\ce{ KCHO2 }$; [590-29-4] NIST WebBook
Strontium formate, $\ce{ Sr(CHO2)2 }$; [592-89-2] NIST WebBook
Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook

Experimental Data

100w₂	100w₁	m₂ (mol/kg) ^b	m₁ (mol/kg) ^b	Phase (s) () ^a
10.91	-	0.69	-	A
7.47	3.42	0.47	0.46	A
6.08	9.23	0.40	1.30	A
4.19	11.94	0.28	1.69	A
2.91	18.60	0.21	2.82	A
1.80	25.70	0.14	4.21	A
1.26	39.74	0.12	8.01	A
1.46	40.35	0.14	8.24	A
1.35	45.23	0.14	10.07	A
1.62	46.30	0.18	10.57	A
1.21	47.30	0.13	10.92	A
1.76	49.34	0.20	11.99	A
1.51	50.14	0.18	12.33	A
1.70	56.10	0.23	15.80	A
1.61	56.93	0.22	16.32	A
2.18	59.63	0.32	18.56	A
2.62	61.73	0.41	20.58	A
3.03	58.81	0.45	18.32	A
3.50	63.15	0.59	22.51	A
3.71	61.22	0.60	20.75	A
3.91	64.28	0.69	24.02	A
4.00	64.44	0.71	24.27	A
6.11	70.01	1.44	34.85	A
6.13	71.79	1.56	38.65	A + B
6.01	71.22	1.49	37.18	B
2.23	73.39	0.49	35.64	B
1.27	79.13	0.36	47.99	B
0.71	81.67	0.23	55.10	B
-	81.82	-	53.50	B

(a) The solid phases are: A = Sr(CHO₂)₂·2H₂O; B = KCHO₂.

(b) The molality values were calculated by the compilers.

IUPAC-NIST Solubility Data Series, SRD 106