6 Write the equation for the reversible reaction of phosphoric acid and water. 7

Question

6 Write the equation for the reversible reaction of phosphoric acid and water. 7 Calculate K, of a weak acid, where [Ho+] 2.500x10 M and the ratio of the concentration of the salt of this conjugate base to the concentration of this weak acid is equal to 1.80x101 M of this acid to the acid. 8 Calculate pH of 0.00330 M HCI and the pH of 2.3 M HF, identify the strong and the weak acid and explain the difference between both, make sure to use chemical reaction equations to explain the differences. Calculate amount of ene steam at temperature of 110 °C 9 rgy required (in kcal) to heat up 1.00 lb of ice from -12 oC to 10 A 2.00 g sample is burned in a bomb calorimeter. What is the energy value of the sample in Cal/kg if the calorimeter was filled with 25.0 L of water and the temperature increased by 3.051 °C?

Explanation / Answer

Ans 6 :

Phosphoric acid is H3PO4 . which is a weak acid , since it does not dissociate completely in water. It donates its proton in the water to form hydronium ion and dihydrogen phosphate ion.

The reaction is given as :

H3PO4 + H2O <==> H3O+ + H2PO4-

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