Acid salt

[Primarygun]

Are we able to determine the amount of acid salt formed in the reaction between phosphoric acid and calcium hydroxide? If the ratio is 1:2.

Is that possible for all salts to be that kind of salt?

[TWJian]

Ca(OH)2 + 2H3PO4 =Ca(H2PO4)2 +2H2O forms in excess of calcium hydroxide

CaHPO4 might also form.(similiar to Na2SO4 and NaHSO4)

 

Phosphoric acid is more complex and might form chains. Several salts will form but the main ones will be Ca(H3PO4)2 and CaHPO4

[Primarygun]

So it's rather difficult for us to determine thw pH value of the mixed solution compared to the mixture of sodium hydroxide and phosphoric acid, right?

[TWJian]

So it's rather difficult for us to determine thw pH value of the mixed solution compared to the mixture of sodium hydroxide and phosphoric acid, right?

 

Huh? We could just insert an electronic pH multimeter and it will tell the pH of the solution. Could you explain what you meant? The pH should be neutral if the reaction is complete.

[Primarygun]

Oh sorry. I asked wrongly.

Theoretically to calculate

[budullewraagh]

Ca(OH)2+H3PO4-->Ca3(PO4)2+H2O

with excess of Ca(OH)2

[TWJian]

Oh sorry. I asked wrongly.

Theoretically to calculate

 

Phosphates makes the calculation hard since there are 3 main ions:phosphate ion(PO4 3-), hydrogen phosphate ion(HPO4 2-) and the dihydrogen phosphate ion(H2PO4 -) since phosphoric acid contains 3 hydrogen atoms for each molecule.

 

I'm rather weak in acidity and basicity.

[budullewraagh]

the more hydronium cations that are displaced, the more difficult the others are to displace

[Tetrahedrite]

Ca(OH)2+H3PO4-->Ca3(PO4)2+H2O

with excess of Ca(OH)2

Adding excess Ca(OH)2 is more likely to form hydroxylapetite, Ca5(PO4)3(OH).

[budullewraagh]

oh good call. wow, i cant believe i forgot that. yeah, so pretty much you have tooth enamel.