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A solidification matrix includes a polycarboxylic acid polymer, sodium carbonate, and water. Exemplary polycarboxylic acid polymers include a polyacrylic acid polymer having a molecular weight of between about 1,000 and about 100,000, a modified polyacrylic acid polymer having a molecular weight of

A solidification matrix includes a polycarboxylic acid polymer, sodium carbonate, and water. Exemplary polycarboxylic acid polymers include a polyacrylic acid polymer having a molecular weight of between about 1,000 and about 100,000, a modified polyacrylic acid polymer having a molecular weight of between about 1,000 and about 100,000, and a polymaleic acid polymer having a molecular weight of between about 500 and about 5,000. The polycarboxylic acid polymer, sodium carbonate, and water interact to form a hydrate solid. The solidification matrix may be used, for example, in a solid detergent composition.

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1. A solid detergent composition consisting essentially of: a polycarboxylic acid polymer selected from the group consisting of: a polyacrylic acid polymer, a modified polyacrylic acid polymer, and a polymaleic acid polymer;sodium carbonate;water;less than 0.5% by weight phosphorous; andat least one

1. A solid detergent composition consisting essentially of: a polycarboxylic acid polymer selected from the group consisting of: a polyacrylic acid polymer, a modified polyacrylic acid polymer, and a polymaleic acid polymer;sodium carbonate;water;less than 0.5% by weight phosphorous; andat least one functional ingredient;wherein the solid detergent composition is a hydrate solid, and if heated at a temperature of 120 degrees Fahrenheit, the solid detergent composition is dimensionally stable and has a growth exponent of less than 2%. 2. The composition of claim 1, wherein the at least one functional ingredient is selected from the group consisting of an alkaline source, detergent builder, surfactant and combinations thereof. 3. The composition of claim 1, wherein the polyacrylic acid polymer constitutes between about 1% and about 15% by weight of the composition. 4. The composition of claim 1, wherein the polyacrylic acid polymer constitutes between about 0.1% and about 10% by weight of the composition. 5. The composition of claim 1, wherein the polymaleic acid polymer constitutes between about 1% and about 15% by weight of the composition. 6. The composition of claim 1, wherein the polymaleic acid polymer constitutes between about 0.1% and about 10% by weight of the composition. 7. The composition of claim 1, wherein the sodium carbonate constitutes between about 20% and about 70% by weight of the composition. 8. The composition of claim 1, wherein the sodium carbonate constitutes between about 20% and about 85% by weight of the composition. 9. The composition of claim 1, wherein the water constitutes between about 2% and about 50% by weight of the composition. 10. The composition of claim 1 further comprising a straight chain saturated carboxylic acid salt selected from the group consisting of salts of acetic acid, gluconic acid, malic acid, succinic acid, glutaric acid, adipic acid, tartartic acid, citric acid and combinations thereof. 11. The composition of claim 1 wherein the composition is a hydrate solid cast capsule. 12. A solid detergent composition consisting essentially of: (a) between about 0.1% and about 15% polycarboxylic acid polymer by weight of the solid detergent composition, wherein the polycarboxylic acid polymer is selected from the group consisting of: a polyacrylic acid, a modified polyacrylic acid, and a polymaleic acid;(b) between about 2% and about 50% water by weight of the solid detergent composition;(c) less than about 40% builder by weight of the solid detergent composition;(d) between about 20% and about 85% sodium carbonate by weight of the solid detergent composition;(e) between about 0.5% and about 8% surfactant by weight of the solid detergent composition;(f) less than about 0.5% phosphorus by weight of the solid detergent composition; and(g) optionally, at least one functional ingredient,(h) wherein the solid detergent composition is a hydrate solid, and if heated at a temperature of 120 degrees Fahrenheit, the solid detergent composition is dimensionally stable and has a growth exponent of less than 3%. 13. A method of forming a solid detergent composition, the method consisting essentially of: combining sodium carbonate and at least one functional component to form a powder pre-mix; andmixing the powder pre-mix with a liquid pre-mix, the liquid pre-mix comprising water, at least one polymaleic polymer, and at least one polyacrylic acid polymer;wherein if heated at a temperature of 120 degrees Fahrenheit, the solid detergent composition is dimensionally stable and has a growth exponent of less than 2%. 14. The method of claim 13 wherein the solid detergent composition is a block. 15. The method of claim 13 wherein the solid detergent composition is a capsule or pellet. 16. The method of claim 13 wherein the solid detergent composition is a tablet. 17. The method of claim 13 further comprising solidifying the composition for between about 1 minute and about 3 hours to form a solid composition.