[PartsPerMillion87]

Would monopotassium phosphate react with calcium hypochlorite? I wanted to make a dry mix of 250 g of monopotassium phosphate to 1 gram of calcium hypochlorite? If they are stable dry, would that change when dissolved in water?

Also, would I be able to add insole-3-butyric acid potassium salts?

[Hunter2]

For what you need this strange mixture. I think if it get wet chlorine gas will devloped.

[Vidya]

Would monopotassium phosphate react with calcium hypochlorite? I wanted to make a dry mix of 250 g of monopotassium phosphate to 1 gram of calcium hypochlorite? If they are stable dry, would that change when dissolved in water?

Also, would I be able to add insole-3-butyric acid potassium salts?

hypochlorites  are not stable

[snorkack]

Would monopotassium phosphate react with calcium hypochlorite? I wanted to make a dry mix of 250 g of monopotassium phosphate to 1 gram of calcium hypochlorite? If they are stable dry, would that change when dissolved in water?

They probably would react when wet, and not in a dry mix.

HClO is a weak acid. pKa +7,52. Slightly weaker than the second base of phosphoric acid (pKa 7,21). In a dilute aqueous solution of NaClO, the equilibrium should be on the side of HClO, slightly.
But it isn´t NaClO. It is Ca(ClO)₂.
The insolubility of CaHPO₄ should drive the reaction to completion even in a dilute solution:
KH₂PO₄+Ca(ClO)₂ =CaHPO₄ +KClO+HClO
But a wet powder is not a dilute solution. No, it should not evolve chlorine in the absence of a reducer. It should evolve Cl₂O:
2KH₂PO₄+Ca(ClO)₂ =CaHPO₄ +K₂HPO₄+H₂O+Cl₂O

Actually, HClO looks slightly like H₂CO₃. Both are weak acids (H₂CO₃ pKa is 6,35) and liable to evolve gases.
Dry mixes of NaHCO₃ with dry solid acids like citric acids are stable, but evolve gas when wet. I expect that dry mixes of Ca(ClO)₂ with dry solid acids should do the same.

Also, would I be able to add insole-3-butyric acid potassium salts?

What is that "insole-3-butyric acid"?

[Hunter2]

In my opinion the precipitation will be Ca₃(PO₄)₂. We use KH₂PO₄ what means fre HClO will be set free. This dispproortionate to Chlorate and Chloride. Chloride it self will react with hypochlorite ans develop chlorine.