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Construct expressions for pH, Kw and Gibbs Free energy

pH=-log[H+] Kw=[H+][OH-] GFE=enthalpy-(temp*entropy)
JD
Answered by Joe D. • Chemistry tutor
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Why can endothermic reactions occur spontaneously if the entropy change is negative for a cooling process?

An endothermic process is one which cools as the reaction proceeds meaning that the entropy change of the reaction will be negative. These reactions may still be feasible as the spontaneous nature of a react...
ER
Answered by Eve R. • Chemistry tutor
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A sample of hydrochloric acid has a pH of 2.34. 
Write an expression for pH and calculate the concentration of this acid.

pH = -log([H+]) Therefore, 10^(-pH) = [H+] [H+] = 4.57x10^-3
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Answered by Charlie N. • Chemistry tutor
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What factors affect the lattice enthalpy of an ionic solid?

We must remember that negative energies (in any context) generally represent energetically stable configurations and as the energy of a system increases, it will become more unstable. Firstly, ionic size aff...
SD
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What is the trend in electronegativity of group 7?

The electronegativity is the tendency of an atom to attract electrons towards itself in a covalent bond. The electronegativity of the halogens decreases down the group as the radius of each atom increases du...
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Answered by Seetal A. • Chemistry tutor
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