Phosphoric acid, H3PO4, is a triprotic acid with Ka1 = 7.5 x 10-3, Ka2 = 6.3 x 10-8 and Ka3 = 4.8 x 10-13. What is the equilibrium constant for the reaction: HPO42-(aq) + H2O (ℓ) ⇆ H3O+ (aq)+ PO43-(aq)

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock