Questions.... HELP!!!!! (1 Viewer)

[kwabon]

got a couple of questions

- In Chateliers principle, what would be the justification for the increase in reactants when the temperature is increase in this equation
CO2 + H20 = H3C02

-on the note of chateliers, when the temp is increased for the above equation, more reactants will be formed....does this also mean that the concentration of the reactants been affected???

-again on the note of chateliers, when the heck is CO2 soluble? is it when the temperature is increase and the pressure is low???? if not please do explain.

-the reason why weak acids do not completely ionise in water is due to the fact that it has strong intramolecular forces?????

-one HSC question no clue how to solve it
phosphorous pentoxide reacts with water to form phosphoric acid according to the following equation
P205 + 3H2O = 2H3PO4
phosphoric acid reacts with sodium hydroxide according to the following equation
H3PO4 + 3NaOH = Na3PO4 + 3H2O
a student reacted 1.42g of phohorous pentoxide with excess water
what volume of 0.30 mol/l NaOH would be required to neutralise all the phosphoric acid produced??


Thanks you so very much for your time

 

[kwabon]

bump

 

[brenton1987]

- In Chateliers principle, what would be the justification for the increase in reactants when the temperature is increase in this equation
CO2 + H20 = H3C02

That equation is wrong.
The equations related to carbonic acid equilibrium are
CO_2(g) <--> CO_2(aq) <--> H₂CO_3(aq) <--> HCO₃^-_(aq) <--> CO₃^2-_(aq)

Since gas solubility is inversely proportional to temperature; an increase in the temperature of the solution decreases the solubility of the gas. So equilibrium is pushed to the left.

-on the note of chateliers, when the temp is increased for the above equation, more reactants will be formed....does this also mean that the concentration of the reactants been affected???

Since there is less gas in solution the number of moles of each subsequent species is going to decrease. Since water is constant the concentration of the dissolved species decreases.

-again on the note of chateliers, when the heck is CO2 soluble? is it when the temperature is increase and the pressure is low???? if not please do explain.

Carbon dioxide is going to be more soluble when the temperature of the solution is low and there is a high partial pressure of carbon dioxide above the surface of the solution.

-the reason why weak acids do not completely ionise in water is due to the fact that it has strong intramolecular forces?????

Yes

-one HSC question no clue how to solve it
phosphorous pentoxide reacts with water to form phosphoric acid according to the following equation
P205 + 3H2O = 2H3PO4
phosphoric acid reacts with sodium hydroxide according to the following equation
H3PO4 + 3NaOH = Na3PO4 + 3H2O
a student reacted 1.42g of phohorous pentoxide with excess water
what volume of 0.30 mol/l NaOH would be required to neutralise all the phosphoric acid produced??

P₂O₅ + 3 H₂O --> 2 H₃PO₄

m_P2O5 = 1.42 g
F_P2O5 = 141.94453 g mol^-1
n_P2O5 = 0.010 mol
n_H3PO4 = 0.020 mol

H₃PO₄ + 3 NaOH --> Na₃PO₄ + H₂O

n_H3PO4 = 0.020 mol
n_NaOH = 0.060 mol
C_NaOH = 0.30 mol L^-1
V_NaOH = 0.200 L

 

[kwabon]

ohh i get
fanks