Thermochemical Reactions: Numerical Solutions by D. James Benton

Author:D. James Benton [Benton, D. James]
Language: eng
Format: epub
Publisher: UNKNOWN
Published: 2019-06-11T00:00:00+00:00

! 40Water Mgphosphate =! H Hdia O Odia Water

Hhphosphate~ Hphosphate~~ H^ Mg^^ Oh~ Phosphate~~~

Mg Mghydroxide Mgphosphate P

Tp=312 K, Pp=1 atm, Q/RTo=0

substance state Y X Z F H/RTo S/R G/RTo

-----------------------------------------------------------------------

Water !lqd 40.0000000 0.9756098 0.97 0.97 -106.9 11.77 -129.6

Mgphosphate !sol 1.0000000 0.0243902 1.00 0.96 -1501.0 40.27 -1578.7

-----------------------------------------------------------------------

reactants 41.0000000 1.0000000 0.97 0.97 -5777.2 510.96 -6763.7

=======================================================================

H !gas 0.0000000 0.0000000 1.00 1.04 90.2 45.36 2.6

Hdia !gas 0.0189833 0.0004632 1.00 1.04 3.2 23.29 -41.7

O !gas 0.0000000 0.0000000 1.00 1.02 102.9 50.41 5.6

Odia !gas 0.0000000 0.0000000 1.00 1.02 3.4 56.40 -105.5

Water !lqd 39.8858112 0.9732749 0.10 0.97 -106.9 11.77 -129.6

Hhphosphate~ !aqu 0.0380577 0.0009287 0.10 0.82 -526.4 15.72 -556.8

Hphosphate~~ !aqu 0.0000043 0.0000001 0.10 0.90 -520.6 8.05 -536.1

H^ !aqu 0.0001025 0.0000025 0.10 1.04 0.5 11.09 -20.9

Mg^^ !aqu 0.0000040 0.0000001 0.10 1.01 -187.8 -2.62 -182.7

Oh~ !aqu 0.0000107 0.0000003 0.10 1.02 -109.4 -0.22 -108.9

Phosphate~~~ !aqu 0.0000000 0.0000000 0.10 0.90 -514.6 -0.79 -513.1

Mg !sol 0.0000000 0.0000000 0.01 1.16 2.7 39.49 -73.5

Mghydroxide !sol 0.0570890 0.0013931 0.01 1.21 -364.3 18.86 -400.8

Mgphosphate !sol 0.9809690 0.0239371 0.01 0.97 -1501.0 40.31 -1578.8

P !sol 0.0000000 0.0000000 0.01 1.15 2.3 37.74 -70.6

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products 40.9810318 1.0000000 0.97 0.97 -5777.2 511.10 -6764.0

-----------------------------------------------------------------------

difference -0.0189682 0.0000000 0.00 0.00 0.0 0.13 -0.3

Note: the ! above indicates non-ideal behavior

At the same conditions (312ºK/38ºC and 1 atm.) and with the differing properties of P vs. S, we see that most of the initial Mg3(PO4)2 remains and very little H2 is formed. The pH of the two solutions will also be quite different. In the first reaction, virtually all of the S ended up as a precipitate, while in the second reaction, none of the P precipitates.

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